TV star Jack Osbourne, the son of rocker Ozzy Osbourne, helped catch an alleged mugger in London by wrestling the man to the ground, a source says.

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The unidentified source said the "Adrenaline Junkie" star was in central London with his mother Sharon when the pair allegedly witnessed the thief steal a woman's purse, The Sunday Telegraph reported.

The source said Osbourne immediately chased the unidentified man and tackled him, enabling other citizens to help him restrain the suspect until police arrived.

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"He was amazing. He ran after the mugger like a man possessed -- a real hero," the source said.

The 22-year-old Osbourne told the News of the World his impromptu crime-fighting decision was merely the "right thing to do" in the circumstances, the Telegraph said.

"I could see the girl was in trouble; it just felt like the natural thing to do. I'm glad it turned out OK," the former star of the reality TV series "The Osbournes" said.