​Yaron Lischinsky and Sarah Milgrim had spent the evening at an event dedicated to bringing together war-torn and politically divided regions of the world when a man with a gun killed the soon-to-be engaged Israeli Embassy staffers Wednesday.

Two people were shot dead outside the Capital Jewish Museum in Washington, D.C., where an event celebrating Jewish American Heritage Month was being held. The victims were a man and a woman. The Israeli embassy said that two of its staff were shot.

Kash Patel, the F.B.I. director, referred to the killings as an act of terror. “Targeted anti-Semitic violence is an attack on our core values and will be met with the full weight of federal law enforcement,” he said on social media.