Pakistan's MQM party leader Altaf Hussain 'held in London'
Leader of the Pakistani Muttahida Qaumi Movement (MQM) Farooq Sattar (3L) announces his party's decision to quit the coalition government in front of the portrait of self-exiled chief Altaf Hussain at a press conference in Karachi on June 27, 2011 - by Rizwan Tabassum
Police said only that a 60-year-old man had been detained at a residential address in northwest London and officers were searching the building.
"Officers have this morning arrested a 60-year-old man on suspicion of money laundering," a statement from the Metropolitan Police said.
Hussain has lived in Britain since the early 1990s, and has said his life could be in danger if he returns to Pakistan.
The Muttahida Qaumi Movement (MQM) has its power base in the violence-wracked city of Karachi.
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