69-year-old Hassan Diab, is being tried in absentia after French authorities declined to issue an international arrest warrant for him.

The newly-reopened and refurbished Bataclan concert hall — where 90 people were killed by ISIS terrorists with automatic weapons and explosive belts in several hours of horror last year - featured Sting as its opening act.

The US State Department issued a travel warning to all of Europe on Tuesday, alerting US citizens to the "risk of potential terrorist attacks throughout Europe, targeting major events, tourist sites, restaurants, commercial centers and transportation."