Turkish officials have accused European governments of attempting to export their Islamic extremist problem to Syria, saying the EU has failed to secure

Turkish officials have accused European governments of attempting to export their Islamic extremist problem to Syria, saying the EU has failed to secure its own borders or abide by pledges to share intelligence and cooperate in fighting the jihadist threat.

The failures were outlined by Turkish officials to the Guardian through several documented instances of foreign fighters leaving Europe while travelling on passports registered on Interpol watchlists, arriving from European airports with luggage containing weapons and ammunition, and being freed after being deported from Turkey despite warnings that they have links to foreign fighter networks.

“We were suspicious that the reason they want these people to come is because they don’t want them in their own countries,” a senior Turkish security official told the Guardian. “I think they were so lazy and so unprepared and they kept postponing looking into this until it became chronic.”

The conversations with Turkish officials took place before the latest Isis-claimed terror attacks in Brussels, but those bombings and the attacks in Paris last November brought into stark relief Europe’s failings in tackling the threat from Europeans intent on travelling to Syria or Iraq to fight with Isis and then returned to carry out atrocities at home.

Authorities in Belgium carried out a series of raids on Thursday and Friday connected with the Brussels attacks and an apparently separate, foiled plot in France.

Belgian police apprehend wounded suspect in Brussels attack raids on Friday

On Wednesday the Turkish president, Recep Tayyip Erdoğan, said Ibrahim el-Bakraoui, one of the bombers at Brussels Zaventem airport, had been detained in Gaziantep in June of last year over suspicions that he intended to travel to Syria as a foreign fighter. Though Belgian authorities were informed of his arrest, they told Turkey that they had no evidence that he had terrorism links and did not request his extradition. He was deported to the Netherlands before returning to Belgium.

Ankara had also warned French authorities about Omar Ismail Mostefai, whose name turned up in an investigation of a cell of French nationals suspected of terrorism links that ran from late 2014 to the summer of 2015, according to a senior Turkish official. Mostefai was one of the Isis militants who stormed the Bataclan concert hall in November last year.

European officials and the US-led coalition have repeatedly said Turkey ought to do more to secure its borders. Critics of Erdoğan accuse Ankara of turning a blind eye to the influx of foreign fighters, saying Turkey hoped to undermine the embattled Syrian strongman Bashar al-Assad. They point to the lack of hindrance encountered by Middle Eastern jihadis travelling through Turkey to Syria, who were prevalent along the established routes and made little effort at discretion on the way to the frontlines.

They also point to the fact that most of the thousands of foreign fighters battling in Syria today entered through Turkey. Vladimir Putin, after a Russian plane was shot down for straying briefly into Turkish airspace, accused Ankara of being “accomplices of terrorists”.

Law enforcement agencies ‘overwhelmed’

“The threat is unprecedented and intelligence and domestic law enforcement agencies appear to be overwhelmed by the numbers involved,” said Aaron Stein, a resident senior fellow at the Atlantic Council and author of a book on Turkish foreign policy. “In many ways, this explains their anger with Turkey. There is an expectation on the EU side that Turkey would put in place secondary measures to stop cross-border movement of people and material to Islamic State.

“Turkey has dramatically increased border security, beginning in March 2015,” he added. “However, before March 2015, there were legitimate concerns about the permissive environment along most of the Turkish-Syrian border.”

Brussels terror attacks: how events unfolded on Tuesday In interviews with the Guardian, Turkish officials challenged the assessment that they did not do enough to combat the terror threat, and provided details of several incidents they say show European governments allowed people to travel to Turkey.

In June 2014, Turkish security officers at Istanbul airport interviewed a Norwegian man who openly told them that he had come to Turkey in order to travel to Syria for “jihad”. Isis had just surged through Iraq, conquering the plains of Nineveh, and would soon announce a caliphate on its territories in Syria and Iraq, upending fragile nation states that had already begun to collapse.

When they searched his luggage, they found that he had managed to travel out of Oslo with a suitcase that contained a camouflage outfit, a first aid kit, knives, a gun magazine and parts of an AK-47, the contents of which had managed to elude customs authorities in Europe.

Two months later, a German man arrived in Istanbul with a suitcase containing a bulletproof vest, military camouflage and binoculars that he managed to carry through an airport in Paris on his way to Turkey.

In 2013, A Danish-Turkish dual citizen, Fatih Khan, left Denmark for Syria, but was detained while trying to cross the border in the Turkish province of Kilis and deported back to Copenhagen. He was given another passport by the Danish authorities, and made his way back to Syria.

That same year, Mohamed Haroon Saleem, a British citizen, arrived in Istanbul from London and travelled to Syria, having managed to travel out of the UK with a passport that was flagged on the Interpol list as stolen or lost.

Mohamed Mehdi Raouafi, a French citizen, left France in January of 2014 to join the war in Syria. Despite his sister warning the Turkish authorities who subsequently informed the French government that he was going there to join radical groups, he was allowed to travel out of France.

The Soufan Group, a respected security consultancy and thinktank, estimated in late 2015 that between 27,000 and 31,000 foreign fighters had travelled to Syria and Iraq to fight alongside militant groups, including 760 from the UK.

Turkey now has a list of more than 38,000 individuals who are banned from entry, based partly on more recent European cooperation and its own investigations into individuals arriving in the country. It has deported over 3,200.

Turkish officials said they approached European counterparts as early as late 2012 to come up with a pooled list of names of potential radicals who would not be allowed inside Turkey, saying they feared the aftermath of revolutions in the Arab world would lead to a vacuum of power that would allow the flourishing of groups such as al-Qaida inside Syria, but their proposal was declined by most intelligence agencies.

Despite efforts by the EU’s counter-terrorism coordinator, Gilles de Kerchove, most European countries were dithering in their response, sharing a limited list of names, and had no policy to specifically address the foreign fighter threat.

“They knew about these people, and they didn’t stop them because they had no legal framework to stop them,” the senior security official said.

Turkish counter-terrorism officials say they needed the lists of suspected radicals since they had no surveillance capability in Europe and had to rely on European intelligence agencies to alert them to potential terrorism suspects. Without European intelligence backing, they could only prosecute them for attempting to illegally cross into Syria and deport them back to Europe. Some of those deported were later given new passports and allowed to travel back to Turkey.

It is unclear why there was so little intelligence-sharing between EU states and Turkey. Turkish officials chalk it up to a multitude of factors: what they say is an attempt by Europe to export its terrorism problem to the battlefields in Syria rather than address rising Islamophobia and problems with integration; laws that limit European surveillance powers, and even a personal distrust of Erdoğan among European leaders due to his Islamist roots.

“Europe knew exactly what was happening, but they started a blame game and said the entire problem was on the Turkish-Syrian border,” the security official said.

“Without taking any responsibility they blamed us for this, on top of the refugee issue. They didn’t like Erdoğan and the Turkish government. Erdoğan was the symbol of political Islam, and so he is supporting Isis.”

The official added: “But where did Isis and Nusra come from? Al-Qaida in Iraq. Did Turkey have anything to do with the formation of AQI? Assad himself was responsible for the release of how many prisoners in 2011? And where are these people now? They are the ideologues of Isis in Raqqa and Tal Abyad.”

“Turkey didn’t create Isis, we probably should have controlled our border much better ... but Turkey’s mistake was actually to follow the lead of the Europeans and the US on Syria,” the official said.

On Friday an updated report published by the New America thinktank in Washington, studying a sample of 604 militants from 26 western countries who joined Isis or other jihadi groups in Syria or Iraq, found that one in seven was a woman, a significant shift from previous jihadi conflicts. The average age was 25 and, for female recruits, it was 22. Almost one-fifth of the sample were teenagers, of whom more than a third were female.

The report, co-authored by security analyst Peter Bergen, concluded that Europe is at greater risk than the US. “The threat to Europe is driven by the large numbers of Europeans who have travelled to fight in Syria and Iraq and who have returned to the west,” it said. “The threat to the United States from returning fighters is low and will likely be manageable. So far, no ‘returnee’ from Syria has committed an act of violence in the United States and only one returnee has been arrested for plotting a domestic attack.”