Police in Pakistan say unidentified gunmen have killed two people and wounded another in a district south of the port city of Karachi.
One of the victims was a local Shia cleric and school teacher.
His 12-year-old son was also killed while another son was injured.
Police officials said two motorbike riders ambushed Syed Razi Haider, a Shia cleric, when he was driving to school with his two sons in a district south of Karachi.
They said the attackers fired at his car, killing Mr Haider and his son Abbas and wounding his other son, Mohammed.
The gunmen fled from the scene and police officials said the killings are part of the sectarian violence that has gripped the city.
Targets
Seven people, five of them belonging to the Shia minority sect of Muslims, have been killed this month.
So far police have not arrested any of the killers.
More than 200 people have fallen victim to sectarian militancy in Pakistan since the government of General Pervez Musharraf took over power in October 1999.
The government last month banned two militant organisations belonging to Shia and Sunni groups. But analysts say the ban has not helped much in combating sectarian violence.