Norwalk, Conn., school lockdown lifted after gun report turns up empty 4 (UPI) -- A Connecticut school was placed under lockdown for about 45 minutes Wednesday after a teacher reported hearing gunshots nearby, police said. A teacher at Cranbury Elementary School in Norwalk, Conn., called 911 after she thought she heard gunshots outside her classroom. Norwalk Police Chief Thomas Kulhawik said officers were in the area Wednesday morning and responded almost immediately to investigate, WCBS-TV, New York reported. The school was put on lockdown as a precaution and children were kept inside as a protective measure. The lockdown was lifted after officers investigated and couldn't find any evidence of gunfire by the school or in an adjacent park. Witnesses outside at the time were interviewed and said they didn't hear anything, Kulhawik said. "There were people that were walking their dogs in the area," he said. They didn't report hearing anything. Cranbury Park, we checked the trails, we checked with people that were in the park, they didn't hear anything and we're checking all the area around there to be safe but so far, there's no other confirmation of any incident.