LOS ANGELES • Pop star Chris Brown was arrested on suspicion of assault with a deadly weapon on Tuesday after a day-long stand-off and search at his Los Angeles home that began when a woman called 911 in the pre-dawn hours, police said.

Brown, 27, denied any wrongdoing in posts on Instagram before he was taken into custody and said he had woken up to find police outside the property in the Tarzana neighbourhood in Los Angeles' San Fernando Valley.

"He is being transported to robbery homicide, where he will be arrested for assault with a deadly weapon," Lieutenant Chris Ramirez of the Los Angeles Police Department told reporters outside the star's home.

He declined to elaborate on the charges against Brown, saying that an investigation was under way.

Earlier, TMZ.com and the Los Angeles Times reported that the singer had pointed a gun at the woman, who later left the property.

Police, who responded to the 911 emergency call at about 3am, spent hours surrounding the home before obtaining a search warrant and beginning a search of the sprawling premises in the early afternoon.

During that search, TMZ posted a photo of Brown standing on the front porch with a police officer and his attorney, Mr Mark Geragos.

"I don't sleep half the night. I just wake up to all these... helicopters, choppers is around, police out there at the gate," Brown said in a video he posted on Instagram as police were stationed outside his house.

"What I do care about is you are defacing my name and my character and integrity," he added, saying he had done nothing wrong and criticising police actions.

"I don't care y'all going to stay playing with me like I'm the villain out here, like I'm going crazy... good luck when you get the warrant or whatever you need to do. You're going to walk right up in here and you're going to see nothing, you idiots," he added.

TMZ reported that the singer had thrown a duffel bag out of a window and that police had recovered a gun as well as drugs.

Ms Baylee Curran, who was crowned Miss California Regional in a beauty pageant this year, identified herself as the caller as she also took to Instagram.

"Do you all honestly think I wanted this and I caused this?" asked Ms Curran, who appeared to be in a moving car. If somebody put a gun to your head, what would you do? Call the police," she said.

She also spoke to TMZ, saying she and a friend went into a hot tub at Brown's house and that the singer became angry when she admired the jewellery of a member of his entourage.

In 2009, Brown assaulted his then-girlfriend Rihanna and last year, finished a lengthy term of probation, community service and domestic violence classes.

REUTERS, AGENCE FRANCE-PRESSE