Mark Wahlberg's Mexican Restaurant Erupts in Flames in Las Vegas, on Video

Mark Wahlberg's Mexican restaurant went up in flames in Nevada ... and the footage showing Wednesday night's fire is downright shocking.

Check out the video ... people are standing outside Flecha Cantina in Las Vegas, staring through the windows at the blaze raging inside the eatery.

A fire truck is parked in front of the joint, but nowhere can you see firefighters battling the inferno.

Unclear if anyone was injured or how much damage was done to the restaurant, but we've reached out to Vegas authorities and Mark's reps to get the lowdown.

The Vegas restaurant opened in September. By the way ... Mark also opened a Flecha in Huntington Beach, California, so you can always go there while the Vegas joint gets back on its feet.