KARACHI, Nov 15 (Reuters) - Two Pakistani boys were killed on Thursday when police and gunmen exchanged fire in Karachi during protests by supporters of opposition leader Benazir Bhutto, police said.

"Two children have been killed in firing by unidentified men in the Lyari area," said senior city police official Fayyaz Khan, referring to an impoverished city neighbourhood well known as a Bhutto stronghold. "They're also firing at the police."

The firing occurred as police chased small groups of young men protesting over President Pervez Musharraf's imposition of a state of emergency on Nov. 3, he said. (Reporting by Imtiaz Shah; editing by Robert Birsel and Roger Crabb)

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