Update: 2 adults, 1 student dead in shooting at San Bernardino school

Two adults are dead, and two people believed to be students are injured.

Four people have been shot at a San Bernardino, California, elementary school in what police are calling a murder-suicide.

San Bernardino Police Chief Jarrod Burguan tweeted the shooting happened in a classroom at Northpark Elementary School around 10:30 a.m. Pacific Time. The Associated Press is reporting a man walked into his estranged wife's classroom, shooting Karen Elaine Smith, 53.

An 8-year-old boy was also killed, while a 9-year-old student was critically wounded. The boys were standing behind Smith at the time of the shooting.

The suspect in the shooting has been identified as 53-year-old Cedric Anderson, police said. He shot himself after shooting Smith and the two boys.

More on school shootings

According to Everytown Research, this marks the 12th school shooting in the United States this year. The 11th shooting of the year happened at the University of St. Thomas in St. Paul Friday night when a student accidentally fired a gun, hitting another student.

The website says there have been 219 school shootings since 2013. And between 2013-15, there were 160 school shootings, which resulted in 59 deaths and 124 non-fatal injuries, Everytown says.

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