A Simi Valley man was arrested on suspicion of attempted murder after allegedly assaulting his mother Saturday night.

The incident unfolded starting at 6:47 p.m. when the 66-year-old mother called 911 and told the dispatcher her son had assaulted her and threatened to kill her, the Simi Valley Police Department reported. The woman and her adult son both live at the home in the 4900 block of Alta Street, located on the north side of Highway 118, generally west of Stearns Street.

Dispatchers told responding officers the mother was hiding in the backyard and the son, identified as 38-year-old Jason Hahn, was in the house armed with a rifle. The mother could not leave the backyard because the access gate was locked, officials said.

Officers set up a rescue team to reach the mother, who was hiding between trash cans and the access gate, authorities said, and successfully removed her from the yard.

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The victim reportedly told officers she had been arguing with her son intermittently that day. The argument escalated and he allegedly choked her and threatened her, authorities said.

The department activated its SWAT team and crisis negotiators. Hahn eventually left the residence unarmed and was taken into custody without incident, officials said. Authorities seized two rifles and a handgun at the scene.

Hahn was arrested on suspicion of attempted murder, making criminal threats and elder abuse, all felonies. He remained in Ventura County jail Sunday in lieu of $500,000 bail. He is scheduled to appear in Ventura County Superior Court on Tuesday afternoon.

Gretchen Wenner covers breaking news for the Ventura County Star. Reach her at gretchen.wenner@vcstar.com or 805-437-0270.

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