Paris is spending 20 million euros ($22 million) to build a protective barrier around the Eiffel Tower to replace temporary structures that were put up after a series of terror attacks.

"Sadly, the risk of terrorism hasn't gone away," deputy mayor Jean-François Martins said at a Paris press conference. "It's not a wall, it's an aesthetic perimeter."

Martins wouldn't confirm a report in Thursday's Le Parisien newspaper that a clear glass structure would be built around the tower's esplanade. The form the new structure takes will depend on solutions proposed in response to the city's call for tenders, he said.

Temporary and movable metal barriers were sporadically thrown up in 2015 and have been in place continuously since France hosted the Euro 2016 soccer championships last summer.