Mischa Barton has been voluntarily taken to hospital for a mental evaluation, according to reports
Officers responded to calls at her West Hollywood apartment after reports of an incident.
A West Hollywood Sheriff's deputy told E! Online: "She was making incoherent statements that made absolutely no sense and she was transported to the hospital."
The O.C. star was transported for a mental evaluation after neighbours found her “rambling” as she leant on her fence in her garden, reports TMZ.
The publication also said that she was found “screaming” that her mother was a “witch” and was heard talking about the “world shattering”.
Mischa was allegedly 'making incoherent statements' when the police arrived
[Mischa Barton] was making incoherent statements that made absolutely no sense.
West Hollywood Sheriff
It is believed the 31-year-old was wearing just a white dress shirt and a tie at the time.
It was also reported that police and firefighters arrived to her property after receiving the emergency call.
The British star – who had just celebrated her birthday – is thought to have cooperated with the emergency responders and was voluntarily taken to the hospital.
Mischa was placed under psychiatric care in 2009 after seeking medical attention for a tooth infection.
At the time, it was said the actress was sectioned after she threatened suicide.
Mischa was placed under psychiatric care in 2009
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She previously opened up about her “breakdown” in 2013 to The People.
Mischa said: "It was a full-on breakdown. It was terrifying. I was never suicidal, I was just overworked and depressed.
"But one slip of the tongue in a heightened moment and you find yourself in that situation."
Express.co.uk has contacted Mischa Barton’s representative.