Ten people have been killed and 10 others injured after a shooting by a student at a Texas high school, says the state governor.

The attacker, who is in police custody on murder charges, was identified as Dimitrios Pagourtzis, a 17-year-old pupil at Santa Fe High School.

The suspect allegedly used a shotgun and revolver apparently taken from his father, who legally owned the weapons.

Most of the dead from the attack in Santa Fe are students, said police.