Others said they helped the wounded, one person tying blood-soaked jeans around a man's injured leg in a bid to stop the bleeding. "Be good an take care of daddy an the pets if something should happen", Her mom said.
Police are warning that the situation is still fluid and are asking people to avoid the area. Johns Hopkins Bayview Medical Centre spokeswoman Monica Stone said that she was unable to provide details about the patients' conditions.
Armed with a 9mm handgun and several magazines, the woman - who cops say was a "temporary employee" at the facility - started shooting outside the warehouse building before moving inside, cops said.
Three people were killed and seven others wounded during the shooting spree just after 9 a.m., authorities said.
Law enforcement officials say the lone suspect in a shooting at a Rite Aid distribution center in northeast Maryland is in custody in critical condition. WBAL investigative reporter Jayne Miller said that the suspect was taken to a hospital. He said authorities don't know her motive.
Police block off roads after an unidentified assailant opened fire at a warehouse complex September 20, 2018 in Aberdeen, Maryland, killing and wounding multiple people, authorities said. The shooter used a 9 mm Glock that was registered in her name, he said.
The reported deadly shooting at a Rite Aid distribution center in Aberdeen, Maryland, shook the nearby community, whose residents described facility employees as "tight-knit" and "nice".
Harford County sheriff Jeffrey Gahler said she arrived "as usual" Thursday morning before she began shooting.
A law enforcement official briefed on the incident, who provided the casualty toll for CNN, said the suspect was at some point a security guard at the Rite Aid support facility where the shooting occurred.
Gahler said there are multiple injuries and multiple fatalities.
Deadly shootings are common in the United States, where the right to bear arms is protected by the U.S. constitution.
David Graf, a local businessman, said police "have the whole area blocked off".
Maryland Gov. Larry Hogan said he is closely monitoring the situation.
"Then, around 2 p.m., four people including a police officer were shot after a man opened fire outside a judge's office in a municipal building in Masontown, Penn". The Baltimore Sun's Cody Boteler reports that the Harford County Sheriff's Department has "confirmed multiple victims".