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Ten people are dead and another 10 wounded after a 17-year-old opened fire Friday at a high school in Santa Fe, Texas, authorities said.

Texas Governor Greg Abbott says police found explosive devices, including a molotov cocktail, at the suspected shooter's home and a vehicle as well as around the Santa Fe High School where the shooting took place.

Law enforcement officials have the shooting suspect in custody, and say he is 17-year-old Dimitrios Pagourtzis, a school junior.

Abbot said the suspect originally intended to commit suicide following the shooting but told law enforcement after he was arrested that he didn't have the courage to go through with killing himself.

U.S. President Donald Trump described the shooting as an "absolutely horrific attack," one of many that have "been going on too long in this country." Trump told the victims and their families that "we're with you in this tragic hour and we will be with you forever." He vowed to get guns "out of the hands of those who pose a threat to themselves and to others."

The Democratic leader of the House of Representatives, Nancy Pelosi, said urgent action is needed to prevent gun violence.

Republican House Speaker Paul Ryan said Congress must implement reforms that lawmakers recently passed "to make schools safer and keep deadly weapons away from those who should not have them."

Santa Fe is located in southeastern Texas between the cities of Houston and Galveston.