The FBI is not aware of any motive or ideology that drove a 16-year-old boy to shoot and kill two teenage schoolmates and injure several others on his birthday.

Early this morning, the suspect entered Saugus High School in Santa Clarita, California, removed a semi-automatic pistol from his bag, then shot five people and himself.

A 14-year-old boy and a 16-year-old girl arrived in critical condition at a nearby hospital but later died.

The suspect is in "grave condition" after surviving a gunshot wound to the head, according to the Los Angeles County Sheriff’s Department.

Police say today is his birthday.

Santa Clarita school shooting Show all 20 1 /20 Santa Clarita school shooting Santa Clarita school shooting Students are escorted out of Saugus High School after reports of a shooting AP Santa Clarita school shooting At least six people have been injured following reports of a shooting at the school, roughly 40 miles north of Los Angeles in Santa Clarita KTLA Santa Clarita school shooting Students are comforted as they wait to be reunited with their parents AP Santa Clarita school shooting Paramedics transport an injured person AP Santa Clarita school shooting Students get on a bus after the shooting AFP via Getty Images Santa Clarita school shooting Police search a home in connection with the shooting AP Santa Clarita school shooting Students are escorted out of Saugus High School AP Santa Clarita school shooting D J Hamburger, center in blue, a teacher at Saugus High School, comforts a student AP Santa Clarita school shooting People are lead out of Saugus High School after reports KTTV-TV via AP Santa Clarita school shooting Women embrace in Central Park after the shooting AFP via Getty Images Santa Clarita school shooting People wait outside of Saugus High School after reports of a shooting on Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County Sheriff Alex Villanueva tweeted that the suspect was in custody and was being treated at a hospital. He said the suspect was a student but gave no further information.(AP Photo/Marcio Jose Sanchez) Marcio Jose Sanchez AP Santa Clarita school shooting Students line up after a shooting AFP via Getty Images Santa Clarita school shooting People wait for students and updates outside of Saugus High School AP Santa Clarita school shooting Ambulances parked outside of Saugus High School AP Santa Clarita school shooting Law enforcement personnel gather outside Saugus High School AP Santa Clarita school shooting The sheriff's office says a male suspect in black clothing was seen at the school NBCLA via Reuters Santa Clarita school shooting A law enforcement official leads students at the scene VIA REUTERS Santa Clarita school shooting Police are searching for a 15-year-old suspect KTTV-TV via AP Santa Clarita school shooting A law enforcement official leads students at the scene VIA REUTERS Santa Clarita school shooting Police are searching for a 15-year-old suspect following a shooting at a high school in Santa Clarita, California.

Three other people are being treated for injuries at area hospitals.

As dramatic aerial footage showed students being escorted from campus by armed deputies, politicians and gun control advocates railed against conditions they argue paved the way for yet another deadly school shooting.

News of the shooting was breaking as Senator Chris Murphy was introducing a measure calling for universal background checks, a proposal that was shut down by GOP senators.

"Republicans objected, my motion failed, and now, as a consequence, the slaughter of our children will continue," he said. "Devastating."

California Senator Kamala Harris told MSNBC that it's "pathetic that people yield to a gun lobby on an issue that affects all our children."

Katie Hill, the former California Congresswoman who recently stepped down from office, said in the statement that the "time is now" to defeat gun control opponents.