RANCHO SANTA MARGARITA (CBSLA.com) — A 17-year-old boy has been arrested for allegedly shooting of his father, an Orange County Reserve Deputy Sheriff.

Officers were called to the scene of the family home at the 21000 block of Shadow Rock Lane Wednesday morning.

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The unnamed victim was found shot and beaten. He remains in critical condition.

Orange County Sheriff’s Department spokesman Jim Amormino told KCAL9’s Michele Gile the victim’s mother made the call to 911.

“At 9:35 a.m. Orange County Sheriff’s received a radio call from the victim’s mother, that she discovered her 50-year-old son inside the residence with severe head trauma,” he said.

A source said the victim was shot and beaten with a blunt object in an upstairs bedroom of the home.

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The victim’s car, a black Volkswagen, was missing from the scene, as was his gun.

Four hours after the 911 call was placed, authorities spotted the vehicle at the 605 and 5 freeways. The car was pursued to East Los Angeles, where the 17-year-old driver was detained.

Trabuco Hills High School in Mission Viejo, where the suspect is believed to be enrolled, was locked down for a time as a precaution.

Officials have no motive yet for what is being called an attempted murder.

Authorities are seeking to obtain a search warrant from a judge and expect to return to the scene of the shooting to collect evidence.

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The suspect, whose identity has not been released, remains in custody.