An international school in Tokyo that was forced to evacuate hundreds of its students on Thursday following a bomb threat returned to routine on Friday after police dismissed the threat as a hoax.

The Metropolitan Police Department on Friday said no device was found in a search of The British School in the capital's Shibuya Ward, which received a phoned in threat on Thursday. The caller appeared to be male and the message was delivered in a "non-Japanese" language, as officials described it.

An MPD spokeswoman told The Japan Times police investigated the call on suspicion of interference with a business — or criminal obstruction of the school's normal activities.