By Kanishka Singh WASHINGTON, April 2 (Reuters) - Islamic Society of Milwaukee President Salah Sarsour, who is a Palestinian American, has been detained by the U.S. Immigration and Customs Enforcement agency, the mosque said on Thursday. ISM, which is Wisconsin's largest mosque, said Sarsour, 53, is a legal permanent resident who has lived in the U.S. for over three decades and was detained on Monday. He grew up in the Israeli-occupied West Bank. "He was pulled over while driving by over 10 ICE agents with no cause," a page on the mosque's website said, adding he was taken out of...