the killings, authorities are continuing to piece together the motives of a muhammad large bowl lahauiej bohlel. police sources say he visited the promenade at least twice in the days leading up to the massacre. the islamic state group has claimed responsibility for the attack, but french interior links to the his terrorist group are yet to be established. the modus operandi is the exact message of the islamic state group. when i call for attacks on national landmarks, on symbolic dates. people are being held for questioning, including a couple suspected of supplying the gun used to carry out the killings. after questioning french authorities believe that mohamed lahouaiej bouhlel became radicalized recently. his estranged wife was held in an investigation but was released sunday. >> i want to take you to the scene in nice on the promenade, the beachfront, where the attacks took place, to the scene .nd what occurred moments ago it was very significant. the pie minister getting booed, and then the first responders getting clapped and applauded. >>[shouting in french] [applause] marc perelman, ou