CHICAGO: At least eight people were killed when a male student opened fire at a Texas high school on Friday, a local sheriff said, as President Donald Trump expressed his "heartbreak" over the "horrific" shooting. Two people have been detained in connection with the shooting and one of them has been identified as Dimitrios Pagourtzis, according to a law enforcement source. The incident took place at Santa Fe High School in the city of the same name, located about 30 miles (50 kilometers) southeast of Houston. "There are multiple fatalities," the sheriff of Harris County, Ed Gonzalez, told a news briefing. "There could be anywhere between eight to 10, the majority being students." The male teen suspect in custody was not immediately identified. A second possible person of interest was being questioned, Gonzalez told reporters. A somber Trump, who was speaking at an event on prison reform at the White House, expressed "sadness and heartbreak" over the deadly shooting spree. "This has been going on too long in our country," Trump said. "We"re with you in this tragic hour." The shooting was the latest in what has become an all-too-familiar situation in American schools, where gun violence has become a part of everyday life. Earlier this year, 17 students and staff were killed in a shooting at a Florida high school -- a massacre that prompted survivors to launch a grassroots campaign against gun violence. The US president, who has previously shied away from gun control measures in favor of arming teachers, said his administration was "determined to do everything in our power to protect our students, secure our schools, and to keep weapons out of the hands of those who pose a threat to themselves, and to others."