A mass shooting at the Riverfront Live music venue in Cincinnati’s East End early Sunday left nine people injured during a birthday celebration.

The shooting occurred just after 1 a.m., and most victims suffered non-life-threatening injuries, though one remains in critical condition.

Police have not released information about a suspect, and authorities are actively investigating the incident.

Witnesses reported a prior altercation before the gunfire, and some family members questioned the venue’s security, Fox News has reported.

Cincinnati Mayor Aftab Pureval called the shooting “senseless” and thanked first responders and hospital staff for their efforts.