The militants were killed when police and other law enforcement agencies launched an operation in the Bakra Peri area of Quetta against suspected insurgents believed to be involved in a series of terrorist incidents, sources said.
The police have also arrested and detained four other suspected militants during the operation that lasted over two hours, a source added.
The authorities were acting on intelligence reports that warned about militants planning a series of fresh terror attacks in the city.
The police cordoned off the area before beginning its assault that was met by rockets fired at them by the militants, police officials said.