A young, soon-to-be-engaged Israeli couple was shot dead near the Capital Jewish Museum in Washington late Wednesday by a gunman who chanted “Free, free Palestine” after the shooting, according to authorities.

A pro-Palestinian man is in custody after allegedly killing two Israeli embassy staffers outside the Capital Jewish Museum in Washington, D.C. late Wednesday. Police said the victims were a young couple who were about to be engaged.

Sarah Lynn Milgrim and Yaron Lischinsky both worked for the Israeli embassy, and were reportedly about to get engaged.