London, England (CNN) -- Police in London said they have launched a murder investigation into the death of a Pakistani politician killed outside his home in the capital.
Imran Farooq, 50, suffered stab wounds and head injuries during the attack in London on Thursday evening and died at the scene, police said.
Farooq was a prominent member of the Muttahida Quami Movement, a part of the coalition government led by President Asif Ali Zardari's Pakistan People's Party in Pakistan's central and southern Sindh province. The party is liberal with a stronghold in Karachi.
London's Metropolitan Police appealed for witnesses to the murder.
No one has been arrested as part of the investigation, being led by officers from Specialist Operations Counter Terrorism Command, police said.
Mohammad Anwar, a member of MQM's Central Coordination Committee, said Farooq led the committee, which is the party's highest decision-making body. Farooq also led international relations and human rights affairs for MQM, Anwar said,
Farooq had moved to London in September 1992 after concluding his "life and liberty were at risk back home," Anwar said.
The party was fighting the military, which Anwar said has bankrupted the country.