Police are investigating the shooting death of a woman inside an apartment in Northeast Philadelphia's Wissinoming section early Thursday.

Two men whom arriving officers spotted on the porch of a duplex that had been divided into apartments were being questioned as possible witnesses by homicide detectives, police said. The shooting occurred about 3:30 a.m. on the 5900 block of Keystone Street.

The victim, who was not immediately identified, was shot once in the chest and pronounced dead at the scene at 3:49 a.m., police said.

Chief Inspector Scott Small said investigators brought in a dog in an effort to find the semi-automatic weapon used in the shooting, but there was no immediate indication the canine found anything.

Other details, including the circumstances surrounding the shooting, were not released.