Three people killed in mass shooting in Maryland

Three people have been killed in another mass shooting in the US.

The attack took place at a business in Smithsburg in Maryland, and a state trooper was shot in the shoulder, according to Governor Larry Hogan.

Hogan said he didn't have all the facts immediately from a briefing with law enforcement but said the suspect shot the state trooper in the shoulder, who then returned fire. He said he didn't know the status of the shooting suspect after the gunfire.

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However, police have said there is no threat to the community.

The shooting occurred at a business in the community of Smithsburg, Washington County Sheriff's Office spokesperson Sergeant Carly Hose said earlier by telephone.

The sheriff's office said it would release information as it was able, saying in a brief statement that the incident was rapidly evolving.

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It declined to elaborate on the exact number of victims or the extent of victims' injuries, although Hogan had said there were potentially three fatalities.

The address given by authorities for the shooting corresponded to a manufacturing facility.

US Representative David Trone, a Maryland Democrat, tweeted that his office was in contact with authorities in the area and actively monitoring the situation in Smithsburg. News photographs showed a large law enforcement presence, including emergency vehicles at the scene.

It's the latest in a spate of mass shootings that has rocked the US in recent weeks.

Smithsburg, a community of nearly 3000 people, is located about 120km northwest of Baltimore.