SANTA FE - Ten people were killed and another 10 injured when a student opened fire Friday at a high school in Texas, the state’s governor said.

“It’s with a very heavy heart that I can confirm that as of this time, there have been 10 lives that have been lost, and another 10 that have been wounded,” Governor Greg Abbott told a news conference.

Authorities said two people have been detained in the shooting at Santa Fe High School. Federal law enforcement officials identified one of them as Dimitrios Pagourtzis, and said he is suspected of having fired the shots.

The alleged shooter used a shotgun and a revolver that were legally owned by his father, Abbott told reporters. Two school resource officers were on the campus and confronted the shooter “early on in the process,” Abbott said.

He said the investigators have found journals on a computer and cell phone owned by the suspect. The boy indicated he wanted to take his own life after the shooting, the governor said at a news conference.

The governor offered his sympathies to the victims then called for lawmakers and others to come together to prevent more tragedies. “We need to do more than just pray for the victims and their families. It’s time in Texas that we take action to step up and make sure this tragedy is never repeated ever again,” Abbott said.

Gunfire erupted at the school, about 20 miles outside Galveston, not long after classes began around 7:30 am officials said. Authorities later found explosive devices — including pipe bombs and pressure cookers — in and near the school, the law enforcement official said.

A male suspect, believed to be a student, has been arrested in the shooting, and a second person — also believed to be a student — has been detained as well, Harris County Sheriff Ed Gonzalez said.

The male that Gonzalez described as a suspect is injured, a law enforcement official said on condition of anonymity. Investigators believe that the second person, an 18-year-old, may be an accomplice but not a shooter, a law enforcement official said.

Two law enforcement officers are among the injured, according to a law enforcement source. One man is in critical condition with a gunshot wound in one of his arms, said David Marshall, chief nursing officer for University of Texas Medical Branch hospital.

This is the 22nd US school shooting since the beginning of the year, and the third instance in eight days in which a gunman was on a school campus.

Witnesses described students running from the school as they heard gunshots; they also described hearing an alarm at the school, though the sequence of events wasn’t immediately clear.

Authorities found explosive devices in the high school and in adjacent areas, said Walter Braun, Santa Fe Independent School District police chief. It wasn’t immediately clear if any had exploded.

Because the devices were found, Braun urged people in the city of about 13,000 people to “not touch any items that look out of place, and call 911” if they see something suspicious.

Investigators Friday afternoon were searching a trailer where they believe the devices were assembled, a law enforcement source said.

The school has been cleared of all students and staff, who have been directed to a nearby facility to reunite with their families, Braun said.