RAF Typhoon jets have been launched to investigate an incident involving a civilian aircraft within UK airspace, the Ministry of Defence has said.
A Pakistan International Airlines plane has been diverted from Manchester to Stansted Airport, a Manchester Airport spokesman said.
An Essex Police spokeswoman added: "An incident has occurred on an aircraft. Police and partners are responding."
The BBC understands that the plane has now landed in Stansted.
A Pakistan International Airlines plane has been diverted from Manchester to Stansted Airport, a Manchester Airport spokesman said.
An Essex Police spokeswoman added: "An incident has occurred on an aircraft. Police and partners are responding."
The BBC understands that the plane has now landed in Stansted.