A CAN of soft drink suspected of being a bomb, which caused an Air Mauritius flight to make an emergency landing in Melbourne on Wednesday, did not contain explosives, police have confirmed.

The plane had been an hour into its journey to Mauritius when the can, which had the word ''bomb'' written on it, was found on-board.

While forensic tests showed the can did not contain explosives, detectives are now investigating how the item ended up on the plane.

Police said investigators did not believe the can had come from Australia and was loaded on to the plane overseas. If this is the case, no offence has been committed under Australian law. No arrests have been made so far.

After initially saying the word ''bomb'' had been written on the can, police yesterday said foreign lettering had been mistaken for the word. But by the afternoon, police confirmed that the word had indeed been written on the can.