Police said they have made more than 20 arrests at a demonstration outside the U.S. embassy in London Friday. Twenty people have been held on suspicion of being members of a banned group and another two were detained for obstruction and violent disorder. A police spokesman declined to confirm a report that the protesters were members of Muslims Against Crusades, a fringe Islamist group.The group, which was banned by Home Secretary Theresa May last month, are notorious for a 2010 protest during which it burned poppies on Remembrance Day and chanted "British soldiers, burn in hell." It had previously held a demonstration outside the U.S. embassy on the 10th anniversary of the 9/11 attacks