Pakistani police detained Imran Khan, the leader of a small opposition party, at his Islamabad home ahead of a planned protest Saturday against the US president's visit, and rounded up dozens of party supporters, his spokesman said. Khan, a former Pakistan cricket captain, was leaving a friend's home after dinner at around 1 a.m. (2000 GMT Friday) when he was served with a detention order, said Akbar S. Babar, a spokesman for Khan's Pakistan Tehreek-e-Insaf or Movement for Justice party. Khan was driven in a convoy of four police vehicles to his home on the banks of a lake near the Pakistani capital, he said. An official at the local police station said at least 10 police were posted outside Khan's home but he could not confirm his house arrest. The official declined to be named as he wasn't authorized to speak to media.