JERSEY CITY, N.J. (CBSNewYork/AP) — Authorities in Jersey City say 12 firefighters were hospitalized with respiratory problems after they responded to an explosion caused by a bug bomb.

None of the injuries is believed to be serious, and all 12 should be released by Sunday night.

City Fire Director Armando Roman tells The Jersey Journal that the firefighters went to a Magnolia Avenue apartment around 10:20 a.m. Sunday after receiving calls about an explosion.

No one was home at the time, so they forced their way inside and were soon overcome by fumes. The injured were taken to Jersey City Medical Center for treatment.

No other injuries were reported.

Authorities say the cause of the explosion remains under investigation.

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