London (Web Desk): British police has 'releases' crew members of Pakistan International Airlines (PIA) after they were detained at Heathrow airport, London late Monday.

At least 13 officials from PIA’s flight PK-758 coming from Islamabad to London were detained over alleged security threats via confidential information.

British Police said, the crew was taken into custody for interrogation over security concerns.

The officials were released and sent back to the hotel after the search operation but the authorities withheld their passports. However, the flight was cleared to take off from Heathrow Airport with replaced crew members but the reason of the detention of crew members is still unknown.

The management of national flag carrier is reportedly mulling protest against the misconduct by British police and to seek the recovery of passports.

In February, a Heathrow-bound PIA aircraft was intercepted and escorted by fighter jets to Stansted Airport in northeast London because of a “vague security threat”. Later, a suspect was arrested and charged with fraud and misrepresentation by Met Police.