WASHINGTON (AP) — A memorial at the National Cathedral in Washington on Thursday will honor the seven World Central Kitchen aid workers killed by Israeli airstrikes in Gaza earlier this month.

José Andrés, the celebrity chef and philanthropist behind the Washington-based World Central Kitchen disaster relief group, is expected to speak at the celebration of life service, and famed cellist Yo-Yo Ma will perform, organizers said.

The Biden administration said Thursday that Douglas Emhoff, husband of Vice President Kamala Harris, and U.S. Assistant Deputy Secretary of State Kurt Campbell would be among senior administration figures attending.

The aid workers were killed April 1 when a succession of Israeli armed drones ripped through vehicles in their convoy as they left one of World Central Kitchen’s warehouses on a food delivery mission. Those who died were Palestinian Saifeddin Issam Ayad Abutaha; Britons John Chapman, James Kirby and James Henderson; dual U.S.-Canadian citizen Jacob Flickinger; Australian Lalzawmi Frankcom; and Polish citizen Damiam Sobol.