At least 12 firefighters were injured — two critically— after a fireworks explosion south of Roswell, N.M., state police reported.

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KOAT reported that the two firefighters who were critically injured were taken to a hospital for treatment. The other 10 injured firefighters were treated at the scene.

The explosion occurred around noon Wednesday in a fireworks storage area on the west side of the Roswell International Air Center.

As KRQE reported, firefighters were packing fireworks for the Fourth of July when the explosion occurred.

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It’s unclear what caused the explosion. Authorities said it took about 20 minutes to get the resulting fire under control.

The Associated Press contributed to this report.