Photo of Bruised Oksana Grigorieva Hits the Web

07/27/2010 at 02:05 PM EDT

Photo of Bruised Oksana Grigorieva Hits the Web
Mel Gibson and Oksana Grigorieva
Albert L. Ortega/WireImage; Richard Young/Startraks
A photo of Oksana Grigorieva with a black eye after an alleged fight with Mel Gibson has surfaced on the Internet.

The close-up shot, which shows the Russian singer, 40, with deep bruises around her left eye, was reportedly taken after she and Gibson, 54, had gotten into a heated argument in January, according to RadarOnline, which posted the photo.

Police launched a domestic violence investigation after Grigorieva accused her ex of punching her in the face "more than once" on Jan. 6, 2010. In her restraining order filed June 25, she alleged the incident also caused a broken tooth.

Sources close to Gibson have denied the allegation, saying he was trying to stop his ex from shaking their 9-month-old daughter Lucia "like a ragdoll."

Meanwhile, Gibson met with detectives Sunday to discuss his extortion claims against Grigorieva, Los Angeles Sheriff's spokesman Steve Whitmore confirms to PEOPLE.

Gibson, who alleges his ex threatened to leak recordings of him to the press if he didn't give her money, reportedly presented authorities with e-mails and texts supporting his claims, TMZ reports.

He, however, did not discuss Grigorieva's domestic abuse allegations. "We'd like to speak to him about that, but he has a Fifth Amendment right not to speak with us," Whitmore tells PEOPLE.

Reporting by KEN LEE

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