Mel Gibson is back in a Los Angeles courtroom to resume his custody fight with ex-girlfriend Oksana Grigorieva.
Gibson and Grigorieva have been sparring for months over custody and financial issues involving their infant daughter.
Investigators are looking into Gibson's allegation that Grigorieva attempted to extort him after their breakup earlier this year. Grigorieva has alleged Gibson struck her during an argument in January.
No criminal charges have yet been filed in either case.
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