A shooting at a Maryland warehouse has claimed four lives, including a female suspect who shot herself in the head, authorities said.
The suspect was a 26-year-old temporary employee at the Rite Aid distribution centre in north-eastern Maryland, Harford County Sheriff Jeffrey Gahler told a news conference.
She had been taken into custody in critical condition that morning. Her name was not immediately released.
Three other wounded people were being treated at a hospital.
- Aerial shots of the scene
It is thought the suspected acted alone using a single handgun and authorities believe there is no wider threat to the public.
Police were called just after 9am local time on Thursday morning to reports of a shooting at the junction of Spesutia Road and Perryman Road in Harford County.
A law enforcement official later confirmed to the Associated Press that a number of people had died in the incident.
There was a heavy police response to the incident at Enterprise Business Park and the status of the suspect is unknown.
The Harford County Sheriff confirmed there were "multiple victims" in the incident.
Harford County sheriff Jeff Gahler said the police did not fire a single shot after arriving at the scene.
Various law enforcement agencies could be seen entering the area as well as numerous ambulances.
The incident took place at the Rite Aid distribution warehouse on the site. A spokeswoman for Rite Aid told Associated Press that the shooting happened in a support facility adjacent to a larger building.