A five-vehicle collision blocked all but one lane of eastbound Interstate 10 near 99th Avenue Monday morning.
The collision at 7:24 a.m. involved a tractor-trailer carrying diesel fuel that developed a slow leak, said Department of Public Safety spokesman Bart Graves.
Arizona Department of Transportation and local fire department units worked to clean up the spill.
A pregnant woman was among several people with minor injuries, Graves said.
There was no indication when the lanes would be re-opened.
No other information was immediately available.
Stay with cbs5az.com and CBS 5 News as this story develops.
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