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TOKYO (AP) _ Hundreds of workers at the Tokyo Stock Exchange were evacuated after a bomb threat was made before trading began on Monday. The evacuation order was lifted about an hour later and trading was unaffected.

About 800 workers at the exchange were evacuated to a park before the start of trading after a man called a Tokyo fire department saying he had planted a bomb, police said.

The caller also said he planted bombs at Tokyo Train Station and the headquarters of Nomura Securities, said police. It was not immediately known who placed the call, though neither Tokyo Station nor Nomura were evacuated.

Despite the threat, stock trading began on time at another building near the bourse. Exchange officials were not available for comment.