SECOND UPDATE: 77 now reported dead, hundreds injured, 42 in critical condition; weapons and grenades found inside the truck.

UPDATE: Supporters of Islamic State celebrating massacre.

Unconfirmed reports are saying that the Islamic State has claimed responsibility for the breaking news attack in Nice, France where a large tractor-trailer accelerated and plowed into a crowd celebrating Bastille Day.

As this report states, the Islamic State is well known “for using vehicles in terrorist attacks, often packing them with explosives for maximum effect.”

And according to SITE Intelligence Group, the Islamic State has previously called for attacks using vehicles. SITE also reported that supporters of IS have been sharing news of the Nice attack and “celebrating” the murders.

Pro-Islamic State forums are also re-posting old messages of the Islamic State urging followers to carry out lone wolf attacks.

At least 73 people are dead and over 100 injured. Some reports say, the injured are in the hundreds.

“Nice, France, truck attack kills 73, official tells French TV”, by Ralph Ellis and Steve Almasy, CNN, June 14, 2016: