Seven people were wounded when two groups of men exchanged gunshots outside a crowded nightclub in the U.S. city of Houston early Sunday, local media reported.

Between 30 to 40 shots were fired during the shooting, which happened in the early morning in Houston's north suburb of Spring, officials told the media.

Seven people were injured and at least one of them was in critical condition, according to local media KHOU.

The shooting reportedly resulted from altercations between the two groups.

Officials did not say how many guns were pulled in the shooting. The gunmen were still at large and no arrest has been made.

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