The Eiffel Tower in Paris, France, was evacuated on Monday afternoon after a man tried to scale it.
Specialist firefighters were on the scene, the police spokesperson said.
"The Eiffel Tower is now closed until further notice", the Eiffel Tower Twitter account said. "We kindly advise our visitors to postpone their visit".
A number of tourists inside the tower were told to stay in place as police negotiated with the man.
The esplanade underneath "The Iron Lady", visited by some seven million people each year, also was evacuated. "We kindly advise our visitors to postpone their visit", tweeted LaTourEiffel.
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Officials haven't immediately provided further information about the incident, and it's not known when the Eiffel Tower will reopen.
According to media reports, when the individual was detected, he was already on the second floor of the tower, 149 metres high.
A photo posted on Snapchat (left) appeared to show the man clinging to the side of the tower.
In 2015, freerunner James Kingston, from Southampton, climbed the Eiffel Tower without safety ropes.