Passengers are now being asked to return to Terminal One following the evacuation but there are still queues in the airport building.
Great Manchester Police have tweeted that the security alert is over and that Terminal One will re-open shortly:
The security alert at Terminal 1 @manairport is now over. The Terminal will be fully open at 12:15hrs. Gerry, TPCSO.
The security alert at Manchester Airport is over and Terminal One is open again.
Greater Manchester Police have said that an "explosive ordinance disposal team" has been called as a precaution and that enquiries are "ongoing," according to BBC News.
Manchester Airport is advising passengers to contact their airline for information about their flights.
On its Twitter feed, the airport advises that Terminal One has been evacuated but provides no further information.
If flying today and concerned about your flight, make sure you make contact with your airline. We'll continue to update through the morning.
@sheldonlloyd T1 evacuated. When we're open, I'll be back in touch. Just T1 affected.
Terminal One at Manchester Airport has been evacuated due to a security alert. Police were called at 8.15am after security staff found a possible suspicious package.
The bomb squad are in the terminal and a 100m cordon has been put up around the building.
Terminal One of Manchester Airport has been evacuated due to a bomb scare, according to local media sources.