A United Airlines flight was forced to divert following reports of bomb on board.

The New York City-bound plane was rerouted to Pittsburgh International Airport, the US Mirror reports.

The jet took off from Chicago and climbed to an altitude of 37,000 feet before an emergency was declared above Lake Erie.

Flight audio from flight UA2092 posted on LiveATC.net indicated that pilots on the flight became alarmed after noticing a ‘beeping’ device.

‘We’ve got an issue up here. We’re getting a sequential beeping of a suspected item onboard. We are going to have to start treating this as a potential bomb,’ the pilot said.

‘We are going to need to go and start a diversion and get things settled. It’s a beeping noise, sequential, one beep per second.’

United Airlines confirmed to the Daily Mail that the Boeing 373 was diverted for a ‘potential security concern,’ but did not confirm it was a bomb threat. 

The 159 passengers onboard had to deplane via slides onto the runway, United said. 

A United Airlines flight was forced to divert following reports of bomb on board

The flight attendants reported the noise to the pilots, they told air traffic control, saying the noise got louder as time went on. 

‘It’s underneath the door, it’s underneath the floorboards,’ the pilot said. 

The plane landed safety and no injuries were reported. 

The Allegheny County Police Department is assisting. The Daily Mail has contacted them for comment. 

It remains unclear what was making the noise.  

This is a developing story, please check back for updates.