Tim Mosenfelder/Getty Images

One of Miley Cyrus' tour buses caught fire and went up in flames early Tuesday morning while en route to the singer's next tour stop in New Orleans.

The cause of the fire is unknown, but no one was injured, according to Cyrus' younger sister Noah, who tweeted about the incident.

"Yes, everyone got out safe no one is injured what so ever!! everything is okay!!" Noah Cyrus wrote.

Miley Cyrus Reveals 'Bangerz' Tour Secrets on 'GMA'

Earlier, she tweeted "Cyrus bus down!!!!" and posted a video of the bus engulfed in flames. The video also included footage of the bus' smoking and charred remains.

It does not appear that Miley was on the bus, which was traveling from Houston to New Orleans as part of her "Bangerz" tour, at the time the fire broke out.

PHOTOS: Miley Cyrus through the Years

According to ABC affiliate WGNO in New Orleans, the singer had been spotted hours earlier eating donuts at one of the city's trendy spots, District Donuts.

Tonight's show is expected to go on as scheduled.