US President Barack Obama joined French President Francois Hollande to pay respects to the victims of the Paris attacks at the Bataclan concert hall, the day before the official opening of a UN climate conference.

The two leaders, along with the mayor of Paris Anne Hidalgo, laid flowers at the music venue where 90 people were killed by jihadist gunmen and suicide bombers on November 13. Helicopters flew overhead and police shut off the roads, with security concerns running high as some 150 world leaders were to descend on Paris for the talks.