A Japanese man has died on a plane after swallowing almost 250 packets of cocaine.

The man went into cardiac arrest from the drug overdose shortly after take-off in the early hours of Friday.

Passengers on board reported seeing the man convulsing.

The Aeromexico flight, which had taken off from Mexico City in Mexico and was headed to Narita, Japan, was forced to make an emergency stop in Hermosillo, some 2,000 miles north.

Authorities identified the man only as Udo N.

They say he had travelled to Mexico's capital from Bogota, Colombia.