A small bomb exploded outside a BankBoston Corp. branch here Friday, in what authorities said may have been a protest against U.S. participation in the Kosovo conflict.

The homemade device was detonated at 3 a.m Friday, said a BankBoston spokeswoman. No one was injured, and the bank opened for business as usual, she said, adding that an Argentine bomb squad had found a protest note tying the bombing to the conflict in Eastern Europe.

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