Following the attacks, intelligence and law-enforcement agencies reviewed intercepted communications and concluded that the attackers had been in touch with members of the Islamic State, American and French officials said
LONDON — The attackers in Friday’s terrorist assault in Paris communicated at some point beforehand with known members of the Islamic State in Syria, officials on both sides of the Atlantic say, adding evidence to the assertions that the radical group coordinated or helped carry out the attacks rather than simply inspiring them.
President François Hollande of France has characterized the attacks, which killed at least 129 people on Friday night, as “an act of war” carried out by the Islamic State, also known as ISIS or ISIL. He provided no specific information, but the Islamic State released statements on Saturday claiming responsibility for the attacks, part of increasing indications that the group is becoming more capable of extending its reach far beyond its base in Syria and Iraq.
“It is an act of war that was prepared, organized and planned from abroad, with complicity from the inside, which the investigation will help establish,” Mr. Hollande said on Saturday.
While the information made available so far about the links between the Islamic State and the Paris attackers was not definitive, it suggested at a minimum that the assailants had not acted totally on their own.