Those responsible for the fatal attack against two Israeli Embassy employees in Washington, D.C., on Wednesday will be prosecuted to the "fullest extent of the law," according to the White House.

Days before they were killed outside D.C.'s Jewish Museum, Israeli Embassy staffer Yaron Lischinsky bought an engagement ring for his colleague Sarah Milgrim.

Israeli Embassy staffers Yaron Lischinsky and Sarah Milgrim were departing an event Wednesday evening when they were gunned down and killed.