Pakistani opposition leader Benazir Bhutto has been killed in a gun and bomb attack after a political rally in the city of Rawalpindi. "She has been martyred," said party official Rehman Malik. Ms Bhutto, 54, died in hospital after reportedly being shot in the head. Police said a suicide bomber fired shots at Ms Bhutto as she was leaving the rally in a park before blowing himself up. "The man first fired at Bhutto's vehicle. She ducked and then he blew himself up," said police officer Mohammad Shahid. Police said 16 people had been killed in the blast. A witness said he saw about eight bodies on a road as well as a mutilated human head. On October 18, a suicide bomber killed nearly 150 people in an attack on Ms Bhutto as she paraded through the southern city of Karachi after returning home from eight years in self-imposed exile. Earlier, gunmen opened fire on supporters of another former prime minister, Nawaz Sharif, from an office of the party that supports President Pervez Musharraf, killing four Sharif supporters, police said. Mr Sharif was several miles away from the shooting and was on his way to Rawalpindi after attending a rally. Mr Sharif, who was overthrown by Mr Musharraf in a 1999 coup and allowed back into the country just last month after seven years in exile, blamed supporters of the pro-Musharraf party for the violence. But a spokesman for the party denied that its workers were involved.