4 dead, including suspect, after Maryland warehouse shooting

Shirley Pollack, of Perryville, Md. reacts to what authorities have called a shooting with multiple victims in Perryman, Md. on Thursday, Sept. 20, 2018. Authorities say multiple people have been shot in northeast Maryland in what the FBI is describing as an “active shooter situation.” Pollack,was concerned about her son who worked near the scene of the shooting. (AP Photo/Steve Ruark)

Aberdeen police officers blocks the entrance of industrial complex where several people had been shot, in Harford County, Md, Thursday, Sept. 20, 2018. Authorities say multiple people have been shot in northeast Maryland in what the FBI is describing as an “active shooter situation.” (AP Photo/Jose Luis Magana)

ATF police officer with a sniffing dog walks out the industrial complex in Harford County, Md., Thursday, Sept. 20, 2018. Authorities say multiple people have been shot in northeast Maryland in what the FBI is describing as an “active shooter situation.” (AP Photo/Jose Luis Magana)

ABDERDEEN, Md. — A 26-year-old woman reported to work Thursday at a Maryland warehouse and got into an argument, then used a gun to kill three people and wound several others before taking her own life, according to authorities and a witness account.

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