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SOFIA, Bulgaria (AP) _ A gunman was arrested just before the start of the recent NATO enlargement summit in the Bulgarian capital, senior police officials said Saturday.

The man, whose identity was not disclosed, was arrested late Thursday near the Hilton hotel in downtown Sofia, Interior Ministry official Boiko Borisov told reporters.

Borisov said the man carried a Scorpion automatic gun with a silencer. A policeman was seriously wounded during the arrest.

Presidents of East European and Baltic countries hoping to join NATO met for a one-day summit Friday in the Bulgarian capital. Of the 10 presidents attending _ Bulgaria, Estonia, Lithuania, Latvia, Romania, Macedonia, Albania, Croatia, Slovenia, Slovakia _ eight were accommodated at the Hilton.

According to Borisov, four of those were a possible target. He said disclosing any details on the identity or nationality of the suspect could prejudice investigations.

Bulgaria, like other European countries, has increased security in the wake of the Sept 11 terrorist attacks in the United States.