News agencies reported that the man in his 70s walked up to the main altar and shot himself the afternoon of May 21 as tourists and worshippers were in the church.

Cathedral officials issued a statement late the afternoon of May 21 confirming that a man committed suicide by firearm as hundreds of people were inside the church. The statement offered no other details.

France's BFMTV reported the man was writer and essayist Dominique Venner, who was identified as a conservative who was a staunch opponent of same-sex marriage. The news outlet said a suicide note was found next to his body.

The reports were not clear whether the cathedral was closed. Church officials said only that it had been evacuated to allow safety forces to respond.

It was not immediately clear how many people were inside the building at the time of the incident. Some 13 million people visit the cathedral annually.

The cathedral is in the middle of yearlong celebration commemorating its 850th anniversary.

French Catholic leaders have been outspoken as they led opposition to the country's same-sex marriage law, signed by President Francois Hollande May 18.