COACHELLA, Calif -

A 31-year-old man was in custody Friday after opening fire in his mother's Coachella home, holding her captive and keeping a SWAT team at bay for nearly nine hours until he was flushed out by teargas, authorities said.

Sheriff's deputies arrived at the home in the 84900 block of Calle Verde minutes after the man's mother reported around 10:30 a.m. Thursday that her son was going "crazy" and had fired a gun, said Deputy Angel Ramos, a Riverside County Sheriff's Department spokesman.

The report received by deputies described suspect Jacob Nunez as mentally disturbed and dangerous.

Deputies surrounded the home after learning that Nunez was holding his mother inside against her will, and, when he refused to surrender, they evacuated nearby homes, closed surrounding streets and placed two area schools on lockdown, Ramos said.

A sheriff's SWAT team and crisis negotiators were called in. During the ensuing standoff, the man's mother was able to escape through the rear of the residence and was taken to a hospital for treatment of minor injuries, he said.

The SWAT team eventually"deployed chemical agents" into the home, prompting  Nunez to surrender without further incident at 7:03 p.m., Ramos said.

Nunez was booked into the Riverside County jail in Indio on suspicion of kidnapping, false imprisonment and witness intimidation -- all felonies -- as well as misdemeanor resisting/obstruction of a peace officer, according to online jail records. 

He was being held in lieu of $50,000 bail and was due in court in Indio on Tuesday, according to the sheriff's department.