The exiled leader of Pakistan's MQM party has been bailed by police in London after being arrested on suspicion of money laundering, a police source said. Altaf Hussain was arrested at his suburban home in the British capital prompting thousands of people to protest on the streets of Karachi, Pakistan's biggest city and his party's power base thousands of people to protest on the streets of Karachi, Pakistan's biggest city and his party's power base.