US troops arrested the leader of one of Iraq's main Sunni Arab political parties at his house in Baghdad today, party officials said.
The US military had no immediate comment on the arrest of Mohsen Abdul-Hamid, head of the Iraqi Islamic Party.
The party officials said it was not clear why he was arrested.
The party boycotted Iraq's January 30 elections but was among several Sunni Arab groups that signalled this month that they were ready to take a greater role in the country's politics.
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Iraq's parliament, dominated by Shi'ites and Kurds, has been trying to involve more Sunni Arabs in politics and the drafting of a new constitution, in an effort to defuse sectarian tensions and undermine the insurgency.