A Plymouth Township man was killed by police officers late Tuesday after repeatedly stabbing his mother and pointing a handgun at the officers who went to his home in response to the attack, authorities said.

Officers were called to a unit in the Plymouth Garden Apartments at 11:30 p.m. for reports of a stabbing, according to Montgomery County District Attorney Kevin Steele.

At the scene, officers found a 22-year-old man, whom police did not identify, armed with a handgun and standing outside the building. The man’s mother was nearby, suffering from multiple stab wounds, Steele said.

The officers ordered the man to drop the weapon, and he refused, according to Steele, and pointed the handgun at the officers. They opened fire, striking him multiple times, the DA said.

Police took the victim to Suburban Community Hospital, where he was pronounced dead at 1:34 a.m. Wednesday. His mother was treated for stab wounds and remained in stable condition.

Steele’s office will be investigating the incident, as is protocol for all police-involved shootings. He did not release the names of the officers involved, or say how many fired their weapons at the victim.

The apartment where the incident took place was still cordoned off Wednesday afternoon. Plastic sheeting weighed down with traffic cones protected the sidewalk leading to the home and several others surrounding it.

Residents of adjacent units either declined to speak or did not answer their doors. A staff member of the apartment complex declined to comment and directed a reporter to leave the area.