I read this on the BBC.
It concerns the Cambodian Midget Fighting League (CMFL)

The fight was slated when an angry fan contested Yang Sihamoni, President of the CMFL, claiming that one lion could defeat his entire league of 42 fighters.

Sihamoni takes great pride in the league he helped create, as was conveyed in his recent advertising campaign for the CMFL that stated his midgets will “… take on anything; man, beast, or machine.”

This campaign is believed to be what sparked the undisclosed fan to challenge the entire league to fight a lion; a challenge that Sihamoni readily accepted.

An African Lion (Panthera Leo) was shipped to centrally located Kâmpóng Chhnãng especially for the event, which took place last Saturday, April 30, 2005 in the city’s coliseum.

The fight was called in only 12 minutes, after which 28 fighters were declared dead, while the other 14 suffered severe injuries including broken bones and lost limbs, rendering them unable to fight back.

Read the article then highlite the following:The whole thing is an internet hoax from 2005, delivered with a straight face by the BBC.