UPDATE | 4 dead, including suspect, after Maryland warehouse shooting

ABERDEEN, Md. (AP) — A woman working a temporary job at a drugstore warehouse in Maryland got into an argument at work this morning and began shooting colleagues, killing three before fatally turning the gun on herself, authorities and witnesses said.

Workers at the Rite Aide distribution center in northeastern Maryland described terrifying moments of "crazy" gunfire and people screaming and running in all directions after the shooting. 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.

Harford County Sheriff Jeffrey Gahler said at a news conference that the woman was later identified as a temporary employee of the distribution center, Snochia Moseley of Baltimore County.

"She had reported for her workday as usual, and around 9 a.m. the shooting began, striking victims both outside the business and inside the facility," Gahler said. "We do not at this time have a motive for this senseless crime."

Krystal Watson, 33, said her husband, Eric, works at the facility and told her told her that the suspect had been arguing with somebody else near a time clock after a "town hall meeting."

"And she went off," she said.

"She didn't have a particular target. She was just shooting," Watson said as she drove away from a fire station where relatives tried to reunite with loved ones.

The sheriff said the call about shots fired came in at about 9:06 a.m. and deputies and other officers were on the scene in just over five minutes. The shooting began outside the business and continued inside, he said.

It appears only one weapon was used – a 9 mm Glock handgun that was registered in Moseley's name – and no shots were fired by responding law enforcement officers, Gahler said.

Walter Zambrano, 64, who described himself as a worker at the distribution center, said he was in the bathroom when shooting broke out and saw nothing as he hid, frightened for his life.

The person was "shooting like crazy," Zambrano said, speaking in Spanish.

He said the gunfire seemed to go on several minutes, and when it was over he sprinted outdoors. On the way out, he said he saw a female co-worker down on the floor. The scene, he said, was one of chaos.

1 p.m.

ABERDEEN, Md. (AP) — Three people were killed this morning in a shooting at a Rite Aid distribution center in northeast Maryland, officials said.

A law enforcement official with knowledge of the shooting stressed the number of dead is based on preliminary information. The official wasn't authorized to discuss details by name and spoke on condition of anonymity to The Associated Press.

A suspect was taken into custody and was in critical condition, Harford County Sheriff Jeffrey Gahler told a news conference.

It appears there was only one weapon, a handgun, that was used and there were no shots fired by responding law-enforcement officers, Gahler said. Gahler also said multiple people had been killed and wounded in the shooting, without giving any other details on casualties.

Gahler said the call about shots fired came in from the Rite Aid distribution center at about 9:06 a.m. and deputies and other officers were on the scene in just over five minutes.

"We are so preliminary in this investigation," Gahler said. "It's so important that we deal in facts." He said authorities don't want to "make it worse" for the families involved by giving out incorrect information.

The attack came nearly three months after a man armed with a shotgun attacked a newspaper office in Annapolis, Maryland, killing five staff members. Authorities accused Jarrod W. Ramos of attacking The Capital Gazette because of a longstanding grudge against the paper.

The FBI described the Aberdeen incident as an "active shooter situation" and said its Baltimore field office was assisting.

In a tweet, Maryland Gov. Larry Hogan said his office is monitoring the situation in Aberdeen and the state stands ready to offer any support.

11:02 a.m.

ABERDEEN, Md. (AP) — Authorities say multiple people have been shot in northeast Maryland in what the FBI is describing as an “active shooter situation.”

The Harford County Sheriff’s Office tweeted that there was a shooting Thursday morning in the Perryman area that involves “multiple victims.” They warn that the situation is still fluid and ask people to avoid the area.

The FBI’s Baltimore field office tweets that it is responding and assisting the sheriff’s office with an active shooter situation. The Baltimore field division of the federal Bureau of Alcohol, Tobacco, Firearms and Explosives tweets that its special agents are responding too.

Maryland Gov. Larry Hogan says his office is monitoring the situation in Aberdeen and that the state stands ready to offer any support.