TUCSON - An ultralight pilot who flew a bit too low crashed his marijuana-stuffed aircraft southwest of Tucson.

The unnamed pilot sustained serious back injuries following Friday night's crash near the Casino Del Sol.

Federal officials think the single-engine plane may have been overloaded with about 350 pounds of marijuana when it clipped electrical lines and crashed.

A spokesman for U.S. Customs and Border Protection says smugglers have been using ultralights to avoid radar.

This particular plane avoided radar after taking off from Mexico, but was eventually spotted by a Customs and Border Protection unmanned aircraft flown by remote control.

Officials say the pilot could face drug smuggling charges as well as charges of illegally entering the U.S.