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Seven people have been killed and 20 others injured in a pair of shootings at the Fort Hood military base in Texas, the US Army has confirmed.
One person has been arrested and at least one more is on the run, reports say. The base has been locked down.
NBC News network said the two suspects were in military uniform and that the shooter-at-large was believed to have a high-powered sniper rifle.
Fort Hood, near the town of Killeen, is the largest US military base.
Home to about 40,000 US troops, the base lies between Austin and Waco, about 60 miles (97 km) from each city.
It is not yet clear whether those reported killed and injured are civilians or military personnel.
White House spokesman Robert Gibbs said President Barack Obama had been briefed on the incident.
Army spokesman Lt Col Nathan Banks at the Pentagon told the Associated Press news agency the shootings had begun at about 1330 (1930 GMT) on Thursday at a personnel and medical processing centre at Fort Hood.
He said two shooters had been involved.
The second incident took place at a theatre on the base, he said.
Local congressman John Carter, speaking to NBC News, said gunfire had erupted during a graduation ceremony.
The BBC's Adam Brookes in Washington says there are military police and Swat teams on the scene, and the FBI is on the way from Austin and Waco. Schools in the area have also been locked down.
One person has been arrested and at least one more is on the run, reports say. The base has been locked down.
NBC News network said the two suspects were in military uniform and that the shooter-at-large was believed to have a high-powered sniper rifle.
Fort Hood, near the town of Killeen, is the largest US military base.
Home to about 40,000 US troops, the base lies between Austin and Waco, about 60 miles (97 km) from each city.
It is not yet clear whether those reported killed and injured are civilians or military personnel.
White House spokesman Robert Gibbs said President Barack Obama had been briefed on the incident.
Army spokesman Lt Col Nathan Banks at the Pentagon told the Associated Press news agency the shootings had begun at about 1330 (1930 GMT) on Thursday at a personnel and medical processing centre at Fort Hood.
He said two shooters had been involved.
The second incident took place at a theatre on the base, he said.
Local congressman John Carter, speaking to NBC News, said gunfire had erupted during a graduation ceremony.
The BBC's Adam Brookes in Washington says there are military police and Swat teams on the scene, and the FBI is on the way from Austin and Waco. Schools in the area have also been locked down.
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