The man, 27, who was due to travel from the airport, was “displaying unusual behaviour” before being stopped and arrested by officers on Wednesday, the Independent Office for Police Conduct (IOPC) said.
The police watchdog has launched an investigation after a man died following his arrest by Border Force officers at Manchester Airport.
IOPC director Amanda Rowe said: “First and foremost, our thoughts are with the man’s family and loved ones, as well as all those affected by his death.
An investigation was launched later that afternoon after a referral was made to the IPOC from the Home Office.
“We have been in touch with the man’s family to explain our role and will keep them updated as the investigation progresses.