Katt Williams -- Arrested After Alleged Battery [Update]

2:02 PM PT -- Katt has been released pending further investigation.

9:58 AM PT -- Multiple sources tell us ... the alleged battery took place at a hotel near the club ... and law enforcement is investigating allegations that Katt hit someone over the head with a bottle.

Comedian Katt Williams was arrested by police in Oakland last night ... in connection with a fight at a club ... TMZ has learned.

Katt was arrested outside Kimball's Carnival in East Oakland around 3 AM. The details surrounding the alleged battery are unclear.

Sources tell us ... Katt was brought to a police station for questioning. He has not yet been released.

Williams is no stranger to the police -- he was detained in L.A. back in October after allegedly pulling a gun on actor Faizon Love. He was released from custody without charges.