Gunshots at Notre Dame Cathedral in Paris

Paris, June 6 Police on Tuesday responded to an alert at Paris's Notre Dame Cathedral amid reports of gunshots and panic.

Officials warned people to stay away from the area after saying there was an "incident" at the popular tourist destination, BBC reported.

One person said on Twitter that he was trapped inside the church and could hear sirens outside.

"So we are trapped in Notre Dame Cathedral. Something is happening outside we don't know what it is. Police sirens can be heard," he wrote.