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SANTA FE, Texas (KDKA/AP) – A shooting at a high school in Texas has resulted in multiple fatalities.

Law enforcement officers responded to a high school near Houston after an active shooter was reported on campus.

The Santa Fe school district issued an alert Friday morning saying Santa Fe High School had been placed on lockdown.

texas school shooting Report: 10 Dead, 10 Injured In Texas H.S. Shooting

(Photo Courtesy: KHOU)

Texas Gov. Greg Abbott says 10 people were killed and 10 were wounded.

The police chief at a Houston-area school district says a police officer was shot and wounded.

Dr. David Marshall is the chief nursing officer at the University of Texas Medical Branch in nearby Galveston. He says one man is in critical condition and undergoing surgery at the hospital after suffering a gunshot wound to the upper arm. It wasn’t immediately clear if the man is the wounded officer.

Two other victims are being treated for gunshot wounds to their legs. Hospital spokesman Raul Reyes says one of those is believed to be a student. The other is a middle-aged woman.

The school’s assistant principal says the shooter has been apprehended.

Law enforcement officials confirmed to CBS News that the suspected shooter has been identified as 17-year-old Dimitrios Pagourtzis.

Pagourtzis plays on the Santa Fe High School junior varsity football team and is a member of a dance squad with a local Greek Orthodox church.

Abbott says Pagourtzis had a shotgun and a .38-revolver. Both belong to his father.

A 16-year-old boy who says he considers Pagourtzis a friend says the Texas high school shooting suspect is interested in guns and war simulation video games, but that he has never about talked about killing people.

Tristen Patterson, a junior at the school, says Pagourtzis didn’t show signs of being bullied, but that he rarely talked about himself.

He says Pagourtzis would sometimes enter the classroom “acting a little bit down or sad. A little bit sluggish. … But he never talked about why.”

According to KHOU, a second student was detained and questioned by police.

After hearing shots fired, a substitute teacher reportedly pulled the fire alarm in an attempt to alert the rest of the school.

Authorities say possible explosive devices have been found at and adjacent to the school.

The Santa Fe Independent School District said in a statement Friday that authorities are in the process of rendering the devices safe.

There’s no indication how many devices have been found. Police asked the public to “remain vigilant” and to call 911 if they see any suspicious items in the area.

A sophomore says it was “chaos” when the fire alarm sounded at Santa Fe High School and people realized it was an active shooter situation.

texas school shooting santa fe high school Report: 10 Dead, 10 Injured In Texas H.S. Shooting

Emergency crews gather in the parking lot of Santa Fe High School where ten people were killed on May 18, 2018 in Santa Fe, Texas. (Photo Credit: DANIEL KRAMER/AFP/Getty Images)

Sixteen-year-old John Robinson says he was in first period English class when the fire alarm went off.

Robinson says: “Everybody was just trying to get away from the school. They kept saying there was a shooter, people were shot.”

Meanwhile, President Donald Trump is sending condolences for the “absolutely horrific attack” at a Texas high school.

Trump is telling those affected that “we’re with you in this tragic hour and we will be with you forever.”

He says his administration is working to protect students, secure schools and keep weapons out of the hands of those who want to do harm.

He called this a “very very sad day.” Trump says “everyone must work together” to keep children safe.

Santa Fe is a city of about 13,000 residents, located 30 miles southeast of Houston.

(TM and © Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)