Police spokesman Richard French says the 47-year-old actor was arrested Wednesday night in the downtown area. French did not have details of the incident.
French said Sizemore remained jailed Thursday morning. His bail was set at $20,000.
Sizemore couldn't immediately be reached for comment. Representatives for two agencies listed as representing Sizemore said they no longer did so.
Sizemore, who appeared in such movies as "Black Hawk Down" and "Saving Private Ryan," was convicted in 2003 of domestic violence involving his ex-girlfriend, former "Hollywood Madam" Heidi Fleiss.
He's also had a string of drug-related arrests in recent years.
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