France aims to wow the world on Friday with an extravagant Olympics opening ceremony through the heart of Paris, officially kicking off a Games fraught with security risks at a time of heightened geopolitical tensions.
Some 45,000 police, 10,000 soldiers and 2,000 private security staff will ensure the safety of the parade along the river Seine, its banks and surrounding monuments, in an unprecedented display of security.
A procession of barges will take nearly 7,000 athletes along the river past Paris's most famous landmarks, while more than 300,000 spectators will watch from the banks.
France is at its highest level of security - though officials have repeatedly said there is no specific threat to the opening ceremony or the Games.
As part of a vast security operation, authorities have turned to powers passed under an anti-terror law, placing 155 people under surveillance measures that strictly limit their movement, according to official data and a Reuters review of cases.
Meanwhile, Israeli competitors are being escorted by elite tactical units to and from events and given 24-hour protection throughout the Olympics, officials say.
Scores of world leaders will be in Paris for the opening ceremony, which will be protected by snipers on rooftops. The Seine's riverbed has been swept for bombs, and Paris' airspace will be closed.
For the Games more generally, radar-surveillance planes and Reaper drones will watch sensitive sites from above, and Mirage 2000 fighter jets will be on standby to intercept aircraft straying into restricted airspace.
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