Air India pilot reports 'there is a suspected bomb on board' as Boeing 777 from Mumbai approaches Heathrow as RAF jets 'are scrambled' after string of hoax threats against Indian airlines

An Air India pilot has reported that there is a 'bomb threat' on board a Boeing 777 plane as it approaches London .

RAF jets appear to have been 'scrambled' following the suspected bomb on board Flight AIC129 from Mumbai as it approaches Heathrow.

Typhoon fighter jets reportedly met Air India's AIC129 in the air due to the active bomb threat alert, according to an aviation expert.

In a clip, the pilot can be heard saying: 'There is a suspected bomb on board, requesting landing sir. We have a bomb threat. Air India 129 is requesting this.'

More than a dozen fake bomb threats have been made against flights operated by multiple Indian air services this week, prompting government and civil aviation authorities to warn that 'very strict action' will be taken.

India's Vistara airline said Thursday that its passenger jet flying from Frankfurt to Mumbai the day before had received a 'security threat' on social media, but landed safely at its planned destination.

'We are fully cooperating with the security agencies to complete the mandatory security checks', Vistara said in a statement.

India's aviation minister Ram Mohan Naidu said late Wednesday that the police had arrested 'a minor responsible for issuing bomb threats' against three flights.

'All others responsible for the disruptions will be identified and duly prosecuted,' Naidu added.

Flights impacted include an Air India plane from New Delhi to Chicago, forced to make an emergency landing in Canada on Tuesday.

On the same day, Singapore scrambled fighter jets to escort an Air India Express plane.