All lanes of eastbound Interstate 10 are now open, after the right two lanes between the Ruthrauff Road and Prince Road exits were closed for several hours.

The eastbound frontage road was also closed.

The delay was caused by a semi-truck that caught fire. The cause is currently unknown.

The incident occurred at about 4:15 a.m., according to the Arizona Department of Transportation website.

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As of 8:15 a.m., traffic was backed up to Cortaro Farms Road. A post on the Arizona Department of Transportation's Twitter account recommended drivers use an alternate route.

At about 9:15 a.m., a tow truck was spotted on the scene moving the trailer.

No one was injured.

Contact reporter Caitlin Schmidt at cschmidt@tucson.com or 573-4191. On Twitter: @caitlincschmidt

I'm a watchdog reporter covering local government, the University of Arizona and sports investigations.