The Eiffel Tower stood dark in a symbol of mourning Saturday night as France struggled to absorb the deadliest violence on its soil since World War II: coordinated gun-and-suicide bombing attacks across Paris that left at least 129 people dead and 352 injured.
President Francois Hollande vowed that France would wage "merciless" war on the Islamic State of Iraq and Syria , which claimed responsibility for the mayhem , as investigators raced to track down their accomplices and uncovered possible links to networks in Belgium and Syria.
Seven attackers launched gun attacks at Paris cafes, detonated suicide bombs near France's national stadium and killed hostages inside the concert venue during a show by an American rock band - an attack on the heart of the pulsing City of Light.
Late Saturday, a crowd of up to 250 people gathered for an impromptu candlelight vigil at the Place de la Republique, the site of a massive demonstration in the wake of the Charlie Hebdo killings earlier this year.
