WASHINGTON (AP) — Two staff members of the Israeli Embassy in Washington were shot and killed while leaving an event at a Jewish museum, and the suspect yelled, “Free, free Palestine” after he was arrested, police said.

The stunning attack on Wednesday evening prompted Israeli missions to beef up their security and lower their flags to half-staff. It came as Israel has launched another major offensive in the Gaza Strip in a war with Hamas that has heightened tensions across the Middle East and internationally and as antisemitic acts are on the rise.

The two people killed, identified as Yaron Lischinsky, an Israeli citizen, and Sarah Milgrim, an American, were a young couple about to be engaged, according to Yechiel Leiter, the Israeli ambassador to the U.S.