Law enforcement officials have said that Shamsud-Din Jabbar, the assailant in the vehicular attack that killed 14 people in New Orleans, was a U.S. native.

The deadly New Orleans attack on New Year’s Day, which authorities say was carried out by a man radicalized by ISIS, is spurring fears of more attacks and raising questions about how President-elect Trump’s isolationist tendencies will affect the war on terrorism.