A gunman opened fire at a US army base in Georgia with “multiple casualties” reported.

Fort Stewart was locked down shortly after 11am local time over an “active shooter incident” in its 2nd Armoured Brigade Combat Team area.

“Casualties have been reported and the situation is ongoing,” they said in a statement.

However, sources told CNN that the gunman was no longer a threat.

Personnel were ordered to stay inside and lock all their windows and doors.

Law enforcement is said to be on the scene at the base, which is around 40 miles southwest of Savannah.

Brian Kemp, the governor of Georgia, said in a statement: “As we remain in close contact with law enforcement on the ground, Marty, the girls, and I are saddened by today’s tragedy at Ft Stewart.

“We are keeping the victims, their families, and all those who answer the call to serve in our hearts and prayers, and we ask that Georgians everywhere do the same.”

Mr Trump reportedly cut a lunch short to receive a briefing on the shooting.

This is a breaking news story. Follow for updates.