Pakistan MQM leader Altaf Hussain arrested in London
3 June 2014 Last updated at 15:09 BST
Police in London have arrested the leader of Pakistan's powerful MQM party, Altaf Hussain, on suspicion of money-laundering.
Police have not named the man but did confirm they' had arrested a 60-year-old man at a north-west London address.
The arrest has sparked panic in MQM's powerbase of Karachi as Shahzeb Jillani reports.