Three Marines have been killed at a US marine base in Virginia after a suspected gunman opened fire on two others before killing himself.
The first victim was shot at Marine Base Quantico at about 11pm local time on Thursday, leading to a standoff between authorities and the suspect, said base spokesman Lt Agustin Solivan.
The Associated Press reported that authorities entered the barracks where the suspect had barricaded himself after the first victim was shot.
Upon entering the authorities found the suspect dead of a self-inflicted gunshot wound, along with a second victim. Solivan could not say what prompted authorities to enter the barracks.
The base lockdown was lifted just before 3 a.m. on Friday.
This is a developing story.
The shootings comes days after seven U.S. Marines were killed in a mortar explosion at an Army munitions depot in Nevada during a live-fire training exercise.
In that incident on Monday, a lightweight mortar exploded prematurely in its firing tube, killing the Marines from Camp Lejeune, North Carolina, who had been undergoing mountain warfare training, and wounding eight other service members.
It prompted the Marines to order a blanket suspension of the use of 60mm mortars pending a review.
Reuters contributed to this report.