By CBSLA Staff

LAS VEGAS (CBSLA) – A bus heading to the Grand Canyon rolled over with 48 people inside, killing one person and injuring 33 others.

It happened around 12:21 p.m. Friday at Mile Post 5 on Diamond Bar Road, according to a deputy with the Mohave County Sheriff’s Department in Arizona. The Las Vegas-based bus was driving to the landmark when it crashed for an unknown reason.

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Two people were critically injured and airlifted to Las Vegas. Seven others had “significant injuries,” deputies said. Thirty-three people were transported to Kingman Regional Medical Center in Kingman, Arizona.

The Red Cross of Central & Northern Arizona tweeted Friday that they are monitoring the situation.

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The names of the victims have not been released. The cause of the crash is still under investigation.