Video shows San Bernardino shooter calmly entering school

In this image made from surveillance video provided by the San Bernardino Police via the San Bernardino City Unified School District, Cedric Anderson walks into North Park Elementary before he opened fire in a classroom in San Bernardino, Calif. The video released Wednesday, May 10, 2017, shows Anderson strolling into the school office at the elementary school on April 10 before killing his estranged wife and an 8-year-old boy. (San Bernardino Police/San Bernardino City Unified School District via AP)

A gunman walked calmly into a San Bernardino elementary school and signed a log book in the school's main office just minutes before he pulled out a gun and opened fire in his estranged wife's classroom, killing her and an 8-year-old student, a video released Thursday showed.

The 37-second video, which was released by San Bernardino police, shows Cedric Anderson strolling into the office at North Park Elementary on April 10. The clip shows Anderson having a brief conversation with the workers in the office before signing a book and then walking calmly out of the room.

Just minutes later, Anderson walked into his estranged wife's special-needs classroom, whipped out a handgun and opened fire without saying a word, police said. Anderson went to the school after failing to persuade his wife to take him back after they broke up just weeks into their marriage, investigators said.

Anderson killed his wife, Karen Smith, and an 8-year-old student, Jonathan Martinez, before fatally shooting himself. A 9-year-old student, Nolan Brandy, was wounded in the shooting and later released from the hospital.

School officials have said security at North Park has been tightened since the shooting.

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