At least 43 people were killed and 72 injured amid widespread violence following the killing of a provincial lawmaker in Karachi in southern Pakistan.
MQM party leader Syed Raza Haider and his bodyguard were shot at a mosque where he was attending the funeral of a relative.
Deputy police superintendent Rafiq Gul says vehicles were set on fire and gunfire erupted.
He says 48 vehicles, eight shops and several gas stations were set ablaze.
The MQM is part of the ruling coalition backing President Asif Ali Zardari's Pakistan People's Party.