- Police received reports of a lorry full of immigrants travelling north on M1
- It was stopped near junction 11 of motorway, near Luton, north of London
- Officers found 16 immigrants, some of whom were taken off in ambulances
- Police said hospital visit was 'a precaution' and they will later be detained
Sixteen people have been detained after police received reports of immigrants in a lorry travelling on the M1.
The vehicle was stopped on the motorway near Luton this afternoon and some of the suspected migrants were then taken to hospital as 'a precaution'.
Pictures of the busy M1 - the main route north from London - show a fleet of police cars and ambulances parked on the hard shoulder where the lorry was stopped.
Those who were taken to hospital via ambulance will receive treatment then be taken back into custody, Befordshire Police said.
The police helicopter was also mobilised to scan the area for anyone who may have escaped the lorry and fled.
Bedfordshire Police said: 'We were called at approximately 2.55pm by Hertfordshire Constabulary after receiving reports of immigrants in a lorry heading towards Bedfordshire on the M1 northbound.
'A number of officers attended and detained 16 people after the lorry was stopped just before junction 11.
'The ambulance service is in attendance and will be taking some people to hospital as a precaution before they are taken to custody.'
The arrests were made just a few miles from where 17 suspected illegal immigrants from Vietnam were detained just last month after a motorist reported 'suspicious activity' in a lorry.
The Home Office said 15 of the 17 - who were all male - claimed to be minors and the 40-year-old lorry driver from Poland was arrested.
People found carrying migrants in their vehicles can face fines as high as £2,000 per person, so the driver today could face a penalty as high as £32,000.