Upon arriving at VSA headquarters, a massive explosion rips through the building, killing several civilians and soldiers. Through the confusion, Kellan meets up with Sinclair; just as a broadcast comes through from Vladko Tyran, leader of "The Black Hand", a paramilitary terrorist group claiming responsibility for the attack. As a result of the terrorism, all Helghast citizens residing on the Vektan side of The Wall are deported to New Helghan. Sinclair sends Kellan under-cover with the rest of the refugees in order to locate Tyran. Eventually he finds Tyran and learns that he is working for Jorhan Stahl (having survived the events of Killzone 3), who plans to use Massar's bio-tech weapon that has been altered to target Vektans. Shortly after, Kellan is taken captive.