The terror expert tweeted: "No proof is provided, but ISIS has rarely claimed attacks that were not by either their members or sympathisers". Paddock, a frequent gambler and drinker by most accounts, has not been revealed to host any radical connections or converted to Islam at any point.
Islamic State (ISIS) is persisting in its claims that Las Vegas gunman Stephen Paddock was acting on the terror group's behalf. The group provided no evidence that it was behind orchestrating the attack or of Paddock's membership.
"But here's why I disagree with those rejecting it out of hand".
In trying to piece together a motive for Paddock's shooting spree, authorities have scrutinized ISIS's claims, but have said they don't believe the militants were involved.
ISIS, which took over almost half of Iraq and Syria at its height in 2014, has been responsible for hundreds of deaths overseas and its elusive leader Abu Bakr al-Baghdadi apparently broke a almost year-long public silence last week to deliver a speech that was recorded and shared by the jihadists.
Abu Baker al-Maqdisi, a senior jihadist associated with the terrorist organization, told Breitbart Jerusalem that mass murderer Stephen Paddock was recruited by ISIS when he converted to Islam several months ago.
Detectives investigating the 64-year-old shooter have so far drawn a blank on what caused him to open fire on the Route 91 harvest country music festival.
59 people were killed and at least 4527 injured when a crazed gunman opened fire on a country music festival in Las Vegas.
ISIS generally does not claim responsibility for attacks it did not authorize or inspire, Callimachi wrote - she said she could find only three instances since 2014 in which the group did so.
It took police an hour and 12 minutes from the first 911 call reporting the incident to locate Paddock. He also wired $100,000 to the Philippines in the days before the shooting, according to a USA official speaking to the Associated Press.