One person was killed and 14 injured in a shooting at the US Army's Fort Hood base in Texas, and officials at the base said the shooter is believed to be dead.

The US Army's Fort Hood has reported an active shooter to Texas authorities.

The US army psychiatrist convicted of the Fort Hood massacre that killed 13 people is due to begin the sentencing phase of his trial possibly facing the death penalty.

A US Army psychiatrist who may face the death penalty after the mass shooting at Fort Hood was charged with 32 counts of attempted premeditated murder relating to the scores of soldiers and two civilian police officers injured in the attack, military officials said.

US federal agencies are blaming each other over security lapses involving the Fort Hood massacre gunman Nidal Hasan.