Pakistan's MQM party leader arrested in London

Altaf Hussain - leader of Pakistan's third largest party the MQM - has been arrested on suspicion of money laundering.

He is one of Pakistan's most powerful politicians but he has been living in the UK in self-imposed exile for more than two decades.

In the party's powerbase, Pakistan's largest city Karachi, police are on the streets and thousands of supporters have been staging a sit-in.

The BBC's Richard Galpin has been to Altaf Hussain's home in London, where he was arrested.