A Tigerair plane was forced to return to Sydney mid-flight after crew were threatened

Roslan Rahman/ AFP/ Getty Images.

A Tigerair plane was forced to return to Sydney mid-flight on Monday after crew were threatened.

The Sydney Morning Herald reports the Australian Federal Police are investigating the incident.

Tigerair flight TT271 bound for Melbourne left Sydney at around 7pm, but turned back mid-flight.

The plane landed in Sydney at 8.30pm, although passengers were asked to remain onboard with their phones turned off for a number of hours while police investigated the threat.

No arrests have been made at this stage, according to the SMH.

Tigerair are working with police to investigate what caused the incident.

“The safety of our crew and guests is always our highest priority,” Tigerair said.

“The matter is now in the hands of the police and we are unable to comment further.”

The SMH has more here.

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