(CNN) Two CSX trains derailed after colliding Wednesday morning in central Florida, the Marion County Sheriff's Office and CSX said.

Two crew members were treated for minor injuries in the 4:15 a.m. collision at a crossing near Citra, about 25 miles north of Ocala, CSX spokeswoman Kristin Seay said.

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One of the trains was carrying nonhazardous phosphate rock; the second was transporting coal, Seay said.

CSX is trying to determine if fuel was released from the locomotives and has sent environmental crews to contain any possible spill.

Some 20 cars derailed early Wednesday north of Citra, Florida, the Marion County Sheriff's Office says.

The cause of the crash has not been determined, but CSX is investigating.

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