Ten people have been killed and about 10 others injured in a shooting by a student at a Texas high school.
The attacker, Dimitrios Pagourtzis, a 17-year-old pupil at Santa Fe High School, is in police custody on murder charges.
US media report that the attacker used a shotgun and revolver apparently taken from his father.
Announcing the horrific crime, Texas Governor Greg Abbott said “various kinds of explosive devices” had been found at the school, 40 miles (65km) south of Houston, and off-campus.
He said police had found information on the suspect’s diary, computer and mobile phone suggesting he planned the attack which has claimed the lives of mostly students.
Santa Fe school police officer John Barnes has been named among the injured. He was in a critical condition and undergoing surgery.
Mr Abbot added that the teenager wanted to take his own life afterwards, but “gave himself up” because “he didn’t have the courage to commit the suicide”.
President Donald Trump, speaking at a prison reform event at the White House, described the attack as “absolutely horrific” and ordered flags to be flown at half-mast at the White House and all public and military buildings.
First Lady Melania Trump tweeted: “My heart goes out of Santa Fe and all of Texas today.”