PITTSBURGH — Pittsburgh police are conducting a manhunt for a man charged with two counts of homicide in the deaths of two sisters shot in their home as their children slept.

SWAT team members and homicide investigators, with the help of police dogs and a helicopter, searched Saturday for Mario Parker, 27, of Hazlewood.

Investigators allege he was one of two gunmen who shot Daneen Robinson, 21, and Rachel Robinson, 32, in their home early Friday as their children — ages 9, 5, and 3 — slept upstairs. The children are now staying with relatives.

Police said Parker, who lives nearby, faces 15 additional charges in the double homicide. Authorities declined to say whether they have identified the second suspect.