An Air India plane travelling from Mumbai to London was forced to turn back mid-flight after a rat was spotted on board.

Flight AI 131 travelling to London on Wednesday was flying over Iran when someone on board said they spotted the rodent, BBC reports.

Passengers continued their journey on a replacement aircraft some time later.

Air India has said that the plane will be fumigated and the presence of a rodent was being investigated.

The airline said that “though the presence of the rodent was not confirmed,” the decision to abort the flight was precautionary and in the interests of passenger safety.

It is not the first time a rat sighting has been reported on an Air India jet, with one of their aircraft forced to return to New Delhi during a flight to Milan in July because of a rodent.