Islamabad, Pakistan (CNN) -- At least 43 people were killed and 72 others were injured as widespread violence broke out overnight following the killing of a provincial lawmaker in the southern Pakistani port city of Karachi Tuesday, police said.
Syed Raza Haider, a leader of the MQM party, was shot Monday evening at a mosque where he was attending the funeral of a relative, according to Rafiq Gul, Karachi's deputy superintendent of police. The gunman also killed the politician's bodyguard.
Gul said Haider's death triggered political and ethnic violence in the city, as mobs set fire to vehicles and gunfire erupted.
Gul said 48 vehicles, eight shops and several gas stations were set ablaze in the mayhem.
The MQM is part of the ruling coalition backing President Asif Ali Zardari's Pakistan People's Party.
CNN's Nasir Habib contributed to this report.