An investigation has begun after a “quantity of heroin” was found on an aircraft after landing at Heathrow from Pakistan.
No arrests were made following the discovery by Border Force officers on the Pakistan International Airlines flight from Islamabad.
But the aircraft was impounded on arrival at Heathrow on Monday afternoon so it could be searched for several hours.
The crew’s passports were temporarily seized.
Reports in Pakistan said the narcotic was distributed in bundles around different parts of the aircraft.
A PIA spokesman for told the London Evening Standard: “Fourteen crew were detained for two to three hours.
“They had to wait for clearance and were shifted to a hotel.”
The aircraft then made a delayed take off back to Pakistan with a new crew.
The UK’s National Crime Agency said no arrests were made but enquiries are ongoing.