This doesnt seem to be you average everyday attack
The fact that such individuals appear to be well equipped and armed means that a certain insititution, country, or enterprise has a target that they wanted to kill
Probably an engineer or a group of engineers whom are working on a top secret project and if my hypothesis is right, then the only intelligence organisations that can bypass or challenge current MIT are in UK, US, Israel, Russia, and China
Probably a UK/US/Israel backed operation involving PKK forces to ensure that no blame falls on them