US forces have arrested in Iraq a commander of the Iranian Revolutionary Guard (Pasdaran)'s Quds Brigade, Mohsen Shirazi, reports said on Tuesday quoting US sources. Shirazi is suspected of having aided Shiite insurgents on Iran's behalf. Shirazi was allegedly arrested in Baghdad in the home of top Shiite politician Abdul Aziz al-Hakim, leader of the Supreme Council for the Islamic Revolution in Iraq (SCIRI). Washington accuses Iran of arming Shiite insurgents in Iraq who are fighting against US-led foreign troops in Iraq.