A man lit a fire near the Chatsworth Reservoir, authorities say, but firefighters were able to contain the blaze and residents chased down the suspect.

The suspect was seen walking away from an area after allegedly lighting a brush fire in the vicinity of Knapp Ranch Road and Woolsey Canyon Road.

A group of neighbors chased down a man suspected of starting a fire Monday afternoon near the Chatsworth Reservoir in Los Angeles, California. (Gabe Cortez, Instagram)

Alejandro Martinez was charged with arson after bystanders saw him allegedly trying to start a fire, then chased him down.