It happened at 7:30 p.m. Sunday in the 1900 block of Rowan Street.
Police say a 34-year-old woman was shot twice in the back and her 13-year-old daughter was shot twice in the right leg. Both were hospitalized for their injuries.
At the time of the shooting, officers told Action News they knew who the trigger man was.
Now they have issued an arrest warrant for 18-year-old Dynek Abdur-Rahman of the 2000 block of North 27th Street.
If you know or see Abdur-Rahman, you are asked not to approach him, but to call 911 immediately.
Tips can also be phoned in to 215-686-TIPS (8477), or submitted anonymously online using this form.
Anyone with information about this crime or suspect can also contact Lt. George McClay of the Philadelphia Police Northwest Detective Division at 215-686-3353.