US President Barack Obama paying a silent tribute yesterday to those who died in Paris' Bataclan concert hall on Nov 13. With him was French President Francois Hollande. Mr Obama is in Paris for the United Nations climate change summit. Attending the summit is "an opportunity to stand in solidarity with our oldest ally, just two weeks removed from the barbaric attacks there", he said in a Facebook post. Mr Obama had received Mr Hollande at the Oval Office last week as part of the French President's whirlwind diplomatic tour to build support for an international coalition against the Islamic State in Iraq and Syria after the Paris attacks, which left 130 people dead. "Nous sommes tous Francais (We are all French)," Mr Obama said, referencing the rallying cry of "Je Suis Charlie" adopted after militants killed 17 people, including staff of French satirical weekly newspaper Charlie Hebdo, in Paris in January.