Gunfire erupted near a busy street festival in the US state of Ohio, wounding at least 12 people and sending some event-goers scrambling for cover while others rushed to help the victims.The shooting was in the city of Toledo, with police responding after reports of a person shot near the Old West End Festival about 5.30pm on Saturday, local time (7.30am Sunday AEST) No suspects were in custody hours afterwards, Toledo deputy police chief Joe Heffernan said, and officials urged people who were at the festival to come forward with any photos or videos on their phones for possible leads.The shooting happened near the Old West End Festival, an annual gathering of live music and home tours.Heffernan said it appeared that at least two people fired weapons and they were "probably shooting at each other"