PARIS — The Eiffel Tower has reopened a day after being evacuated because of a bomb threat from an anonymous caller.

Paris police said Wednesday that no enhanced security measures were planned at France’s most visited monument, and an investigation has been handed over to the city prosecutor’s office.

Explosives experts found nothing suspicious, and there was no immediate claim of responsibility.

Parts of a second tourist hub — the Saint-Michel subway station near Notre Dame Cathedral — were briefly evacuated following a similar threat. An attack there in 1995 killed eight and injured scores of people.

The head of France’s counterespionage agency was quoted over the weekend as saying the risk of an attack in France has never been higher.