The felony charge stems from an early-morning incident, when a woman called 911 from outside of Brown's residence, saying she needed help, LAPD spokesman Tony Im said.
Brown was arrested without incident at his house around 5 pm, Im said, who could not confirm the weapon Brown allegedly used. He has not been yet booked at jail.
The singer's arrest came after an hours-long standoff with police, who were awaiting a judge's approval for a search warrant.
Detectives eventually searched the property after Brown's lawyer Mark Geragos arrived, according to the Los Angeles Times.
Geragos told the Times that Brown denies any wrongdoing.
A woman called 911 to report Brown had threatened her with a gun and that she had run outside to call police, the L.A. Times reported, citing police sources. TMZ, first reported the alleged threat.
As police waited outside, Brown - who has had several high-profile run-ins with the law, most notably for the 2009 assault of then-girlfriend Rihanna - took to Instagram to post videos. In them, he rails against the police and the media, declares his innocence and expresses exasperation with the controversy.
"So I'm asleep half the damn night and I just wake up, and all these [expletive] helicopter choppers is around, police out there at the gate," he says in one. "What the [expletive] do you want from me, bro? I stay out the way, I take care of my daughter, do work."
"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," Brown adds in another video. "I'm tired of dealing with you all. You all are the worst gang in the world, the police. I said it."
"Every three months you come up with something, bro," he says in one of them. "What's going to be next?"
The Grammy-winning Brown also took time to plug his new song and video, Grass Ain't Greener.
"Y'all ain't doing anything but giving me better publicity. 'Barricaded myself in my house?' Have you seen my house? Imma barricade myself in a palace. I'm not coming out. For what?"
According to TMZ, rapper Ray J was among the people in Brown's house Monday night and when he tried to leave, police handcuffed him, then let him go. By Tuesday afternoon, Ray J had also posted an Instagram video, saying he was "real upset about today" and that he supported Brown.
"I'm not happy with how things are handled and how people can take a false story and blow it up into something way more than it should be," Ray J said. "You got just positive people around and you look outside and it's like a war zone for no reason. For what? Some strangers said something that don't got nothing to do with nothing. And to react like that, so fast, without really knowing the facts . . . it shouldn't be like that."
In 2009, Brown pleaded guilty to a felony charge for assaulting Rihanna and received five years' probation. He was also ordered to take domestic-violence classes.
Brown was jailed in 2013 for a hit-and-run charge that was later dropped after he reached a "civil compromise" with the other driver.
Brown pleaded guilty in 2014 to misdemeanor assault for punching a fan seeking a photograph with him.
©2016, The Washington Post
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