Yihong Peng was arrested on Saturday night in San Juan Capistrano, California

Neighbors called police at 10.25pm after seeing him in the street with a knife

Police found his mother Weiping Shen, 59, dead and his father Goujun injured

Peng had recently broken up with his live-in girlfriend at the time, neighbors say

The 30-year-old is being held in county jail on a murder charge

Yihong Peng, 30, was arrested on Saturday night at 10.25pm after neighbors saw him standing in the street with his knife. Peng is pictured above shirtless in his mugshot

A 30-year-old man has been arrested for allegedly murdering his mother and stabbing his father when they tried to console him as he reeled from breaking up with his girlfriend.

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Yihong Peng was arrested on Saturday night after attacking his mother Weiping Shen and father Goujun, both 59, at his home in San Juan Capistrano, California.

Neighbors called police after seeing Peng in the street with a knife in his hand. When police arrived, they found his mother dead inside the home and his father seriously wounded.

Neighbors said the man had recently broken up with his live-in girlfriend and was going through a 'difficult time'. It is not clear if this is his girlfriend but he appears in several social media photos with the same woman

One neighbor said the couple had gone round to their son's home to comfort him after he broke up with his long-term girlfriend.

She said he was going through a difficult time and was struggling to cope with the break-up.

'Yesterday his parents came to console him he was going through a difficult time,' Susan Larsen told NBC Los Angeles.

She said he and his girlfriend had been living together until recently.

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Police found the man standing in the street with bloody hands and a knife near his home in this gated street in San Juan Capistrano, California

When police arrived at the scene, Peng was standing in the street with a bloody knife in his hand.

He tried to run away on foot but was caught not long afterwards and was taken into custody.

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Peng has been charged with one count of murder. His father remains in hospital but is expected to survive.

Neighbor Susan Larsen (left) said the man was going through a 'difficult' time but was a good person