No arrests have been made. The fireworks were found thanks to a tip, officials said.
The 32 cases of commercial-grade fireworks were reported missing Thursday and believed to be stolen from a CSX train shipment. The train went through Ohio, where officials believe the fireworks may have been stolen.
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Ginger Colbrun, spokesperson for the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), said 30 of the cases have now been recovered.
The cases include 2.5-inch and 5-inch aerial commercial-grade fireworks shell, which are used in public fireworks displays. The fireworks could be very dangerous in the wrong hands, a source told ABC News.
Authorities continue to investigate.
Anyone with information is asked to contact the ATF's Detroit Field Division tip line at 312-202-3400.
CSX said they are cooperating with the ATF.
"CSX reported the theft as soon as it was discovered, upon the train's arrival in Detroit," the company said in a statement Friday night. "Safety is CSX's highest priority, and CSX is committed to continuing to work with ATF in its investigation of this incident."