FORT HOOD - AN ARMY psychiatrist who went on a shooting rampage at Fort Hood still had nearly 200 rounds of ammunition and a second gun in his pockets when he was shot by police, a military court heard on Wednesday.

The gunman had already fired nearly 150 rounds inside a crowded medical building on Nov 5 from a semi-automatic weapon, killing 13 and wounding dozens, Army investigator Kelly T. Jameson testified at a hearing to determine whether accused gunman Major Nidal Hasan will stand trial.

Authorities believe Hasan only fired the semi-automatic because bullets recovered from the victims were from that gun, Mr Jameson said.

Hasan had fired another 70 rounds outside the building, Army investigator Duane Mitchell testified.

Sgt Mark Todd, a civilian police officer at Fort Hood, told the Article 32 hearing that after responding to a call of 'shots fired', he saw a gunman outside a building and then saw the weapon's red laser sight pointing right at him.

'I said, 'Halt! Military police! Drop your weapon!'' Sgt Todd testified. Instead, the gunman dressed in an Army combat uniform 'fired a couple of rounds.' Sgt Todd said he yelled at the shooter again, and the two exchanged gunfire.

Gunman had 200 rounds