LONDON – Eleven crew members of the Pakistan International Airline flight, in which a ‘quantity of heroin’ was allegedly found, returned back from London on Thursday.

The crew made its way back from London Heathrow Airport, where their passports were withheld by British authorities who earlier searched the national flag carrier aircraft.

According to PIA sources, an inquiry has been launched into the matter of the heroin found on the flight, and CCTV footage from the flight is being reviewed to trace the culprit behind loading the heroin.

British authorities had confirmed on May 17 that their Border Force officers had found a “quantity of heroin” on board a PIA flight that landed at Heathrow Airport on May 16.

The authorities had further said National Crime Agency officials were investigating the case after the seizure of narcotics from the plane.

Earlier on Wednesday, PIA spokesperson Mashhood Tajwar had confirmed that British authorities had “thoroughly searched” and detained the flight crew after they landed at Heathrow Airport.

‘Flight 785 from Islamabad to London had landed at 2:50pm Monday. Upon landing, as passengers disembarked, the flight crew and aircraft were searched by the authorities’ the spokesperson said.

‘Fourteen crew members were released after being detained for nearly two hours by British authorities’ Tajwar added.