Cops visited the funnyman’s Los Angeles home and detained him for allegedly endangering four children, according to TMZ.com.
Editors of the website report officials at L.A. County Department of Children and Family Services found guns and illegal drugs in the house which they deemed a safety hazard for the kids.
Williams was being held on $100,000 (£62,500) bail as WENN went to press and the children were reportedly placed in protective custody.
The case is due to go before the District Attorney next week (begs31Dec12) to determine whether Williams will face felony child endangerment charges.
The arrest is the latest legal woe for Williams – earlier this week (begs24Dec12) it was revealed he is facing a $4 million (£2.5 million) unpaid tax bill, while he has been arrested on several occasions in recent months over allegations including harassment, assault and reckless driving.