PHILADELPHIA (WPVI) -- Philadelphia police believe a 62-year-old man killed his wife inside their Northern Liberties home.
Officers responded to the 300 block of West Poplar Street shortly before 1 a.m. Friday.
They had received a call about a person with a gun and the possibility someone had been shot inside a home.
When they couldn't get into the home, officers declared it a barricade situation and the SWAT unit was called in to assist.
After police confirmed someone had been shot, SWAT members forced their way into the home.
Once inside, they found a 55-year-old woman lying in the third-floor bedroom. She was pronounced dead at the scene.
They took her 62-year-old husband into custody after he was discovered in the basement.
"We believe this individual is the one who was responsible for the murder. Both parties were a married couple," Philadelphia Police Captain Bill Fisher said.
Police say relatives of the pair, including children, were found hiding in a basement closet. They were not harmed.
Officers are still trying to determine what led to the bloodshed.
They say they had never been called to the home before this incident.