Story highlights Police say a 16-year-old was burned to death in Guatemala this month

It's one of more than 20 such killings this year

Some slam so-called vigilante justice; others say authorities can't be trusted

(CNN) A large crowd stands by as a teenage girl -- beaten and bloodied -- writhes on the ground, her body engulfed in flames.

"Add gasoline," someone shouts.

The shocking scene from a Guatemalan village went viral online and has spurred a debate over what some describe as vigilante justice in the Central American country.

Citing witnesses in the village of Rio Bravo, local media reported that the girl was beaten and burned to death for her alleged involvement in the killing of a taxi driver there earlier this month.

Police told CNN they haven't verified the authenticity of the video. But they said they are investigating the circumstances leading up to the death of a 16-year-old girl who was set on fire in Rio Bravo, a small village two hours west of Guatemala's capital in the state of Suchitepequez.