AUSTIN -- A soldier opened fire Wednesday on fellow service members at the Fort Hood Army post, killing three people and wounding 16 before committing suicide.
Personnel on post were told to shelter in place for four hours before they were given the all-clear from post officials.
Army officials say the shooter died of a self-inflicted gunshot wound after a short shootout with military police.
BREAKING: Multiple sources: Alleged Ft. Hood shooter is dead; believed to be a soldier and the only shooter: http://t.co/wpQgeXknel— ABC News (@ABC) April 2, 2014
Officials say there is no indication that this incident is tied to terrorism at this time. The shooter, who has not been identified, is said to have served in Iraq back in 2011.
Twenty-one ambulances, 70 police cars and a SWAT team was dispatched to the crime scene.
Fort Hood says the injured have been transported to Carl R. Darnall Army Medical Center as well as Scott & White Hospital in Temple.
Scott & White, the nearest trauma center to the post, says a total of nine patients have been admitted to the ICU. Their conditions range from stable to critical, doctors say. The victims suffered gunshot wounds to the neck, chest and abdomen.
The incident happened around 4:30 p.m. at the medical brigade and transportation buildings, according to officials.
The 1st Calvary Division, which is based at Fort Hood, also sent a Twitter alert telling people on base to close doors and stay away from windows. Warning sirens were wailing in the area.
ALERT: All personnel on Fort Hood should shelter in place immediately, close doors and stay away from windows.— 1st Cavalry Division (@1stCavalryDiv) April 2, 2014
A soldier at Fort Hood told our sister station that he heard at least 20 shots on post.
President Obama said, "We're heartbroken something like this might have happened again," following Wednesday's shooting.
Fort Hood was the scene of a 2009 massacre in which 13 people were killed and 30 others were injured.
KVUE, KENS-TV, USA TODAY, ABC News, CNN and the Associated Press contributed to this report.