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Harford County Sheriff Jeffrey Gahler (Front) speaks during a press conference near the shooting scene in Harford County, Maryland, the United States, on Sept. 20, 2018. A woman with a handgun opened fire on Thursday morning at a U.S. Maryland distribution center, killing three people and injuring three others before taking her own life, local police said. (Xinhua/Liu Jie)

WASHINGTON, Sept. 20 (Xinhua) -- A woman with a handgun opened fire on Thursday morning at a U.S. Maryland distribution center, killing three people and injuring three others before taking her own life, local police said.

The 26-year-old woman shot herself twice in apparent suicide attempts after opening fire at drugstore Rite Aid's distribution center in Aberdeen, Harford County. She worked there as a temporary employee, Harford County Sheriff Jeffrey Gahler said.

Rite Aid spokeswoman Susan Henderson told CNN that about 1,000 employees work at the facility "where products are received and processed for delivery."

"The shooting happened adjacent to the primary building, "Henderson said.

One day earlier, at least four people were injured in a shooting at a judge's office in Fayette County, Pennsylvania. The shooter was reportedly dead on the scene.

The Fayette shooting came just hours after a gunman opened fire on Wednesday morning at a Wisconsin software company, wounding at least three people before being killed in a shootout with police.

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A police officer stands guard near the shooting scene in Harford County, Maryland, the United States, on Sept. 20, 2018. A woman with a handgun opened fire on Thursday morning at a U.S. Maryland distribution center, killing three people and injuring three others before taking her own life, local police said. (Xinhua/Liu Jie)

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Harford County Sheriff Jeffrey Gahler (Front) speaks during a press conference near the shooting scene in Harford County, Maryland, the United States, on Sept. 20, 2018. A woman with a handgun opened fire on Thursday morning at a U.S. Maryland distribution center, killing three people and injuring three others before taking her own life, local police said. (Xinhua/Liu Jie)

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A police car is seen near the shooting scene in Harford County, Maryland, the United States, on Sept. 20, 2018. A woman with a handgun opened fire on Thursday morning at a U.S. Maryland distribution center, killing three people and injuring three others before taking her own life, local police said. (Xinhua/Liu Jie)

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Harford County Sheriff Jeffrey Gahler speaks during a press conference near the shooting scene in Harford County, Maryland, the United States, on Sept. 20, 2018. A woman with a handgun opened fire on Thursday morning at a U.S. Maryland distribution center, killing three people and injuring three others before taking her own life, local police said. (Xinhua/Liu Jie)

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Harford County Sheriff Jeffrey Gahler speaks during a press conference near the shooting scene in Harford County, Maryland, the United States, on Sept. 20, 2018. A woman with a handgun opened fire on Thursday morning at a U.S. Maryland distribution center, killing three people and injuring three others before taking her own life, local police said. (Xinhua/Liu Jie)

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Harford County Sheriff Jeffrey Gahler (Front) speaks during a press conference near the shooting scene in Harford County, Maryland, the United States, on Sept. 20, 2018. A woman with a handgun opened fire on Thursday morning at a U.S. Maryland distribution center, killing three people and injuring three others before taking her own life, local police said. (Xinhua/Liu Jie)

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Harford County Sheriff Jeffrey Gahler (C) speaks during a press conference near the shooting scene in Harford County, Maryland, the United States, on Sept. 20, 2018. A woman with a handgun opened fire on Thursday morning at a U.S. Maryland distribution center, killing three people and injuring three others before taking her own life, local police said. (Xinhua/Liu Jie)

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A police officer stands guard near the shooting scene in Harford County, Maryland, the United States, on Sept. 20, 2018. Three people were killed and two others wounded in a shooting on Thursday morning at a business park area in Harford County, the authorities said. (Xinhua/Liu Jie)

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A police officer stands guard near the shooting scene in Harford County, Maryland, the United States, on Sept. 20, 2018. Three people were killed and two others wounded in a shooting on Thursday morning at a business park area in Harford County, the authorities said. (Xinhua/Liu Jie)

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Photo taken on Sept. 20, 2018 shows the signboard of a business park where a shooting occurred in Harford County, Maryland, the United States. Three people were killed and two others wounded in a shooting on Thursday morning at a business park area in Harford County, the authorities said. (Xinhua/Liu Jie)

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