A woman used a handgun to kill three people and wound another three before committing suicide on Thursday at a pharmacy distribution facility in Aberdeen, Maryland, the Harford County Sheriff's Department said.
Sheriff Jeffrey Gahler said at a press conference that the woman, a 26-year-old temporary employee, came to the Rite Aid pharmacy distribution facility, as she did every day, but on Thursday opened fire for as yet unknown reasons.
Three people were killed, one of them dying at a local hospital, while three others were wounded, but Gahler said doctors expect them to recover.
The shooter also died at a hospital after shooting herself.
At an earlier press conference Gahler had said that the shooter was in custody and in "critical" condition at a local hospital.
Authorities were informed of the incident at 9:06 am and deputies responded to a Rite Aid distribution center in Enterprise Business Park within five minutes, the sheriff said.
Reports were that the shooter used one handgun in the incident and Gahler said that none of the responding officers fired their weapons.
Rite Aid pharmacy chain spokesperson Susan Henderson confirmed to CNN that the shooting took place at one of their facilities, where about 1,000 people work.
Aberdeen is a town of some 14,000 residents located 55 kilometers (34 miles) north of Baltimore.