At least seven people have been killed and 12 others injured in a shooting at the Fort Hood military base in Texas, according to US media reports.

One person has been arrested and a second is on the run, ABC news reports. It said the base had 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, located near the town of Killeen, is a large US military base.

It is not yet clear whether those reported killed and injured are civilians or military personnel.

http://news.bbc.co.uk/2/hi/americas/8345713.stm