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.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
About VDC
Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.