Katt WiIliams Arrested for Child Endangerment

Katt Williams was arrested Friday for allegedly endangering his 4 children ... TMZ has learned.

Law enforcement sources tell TMZ ... LAPD cops picked Katt up at his Woodland Hills home this morning, after an investigation from the L.A. County Dept. of Children and Family Services concluded there were numerous guns and illegal drugs in the house that created a safety hazard for the kids.

Our sources say ... during the arrest various items were seized.

Katt is still in custody ... being held on $100,000 bail. As for the kids ... authorities have placed them in protective custody