Officials say a 28-year-old with US citizenship had Molotov cocktails in his backpack and called for "death to America".

A 31-year-old Illinois man has been charged with two counts of murder after opening fire 21 times on a young couple exiting an event at the Capital Jewish Museum in Washington, D.C., late Wednesday, according to a criminal complaint, shooting the victims in the back and then firing again at the woman as she tried to crawl away.

The President led U.S. lawmakers in condemning the killings and said they were "based obviously on antisemitism."

"I think this is just one dude who is genuine in his actions and maybe, you know, a little, a little bit brain broken," Piker said of the DC shooter.

Two members of the Israeli Embassy staff were gunned down outside an event at the Capital Jewish Museum in Washington, D.C., on Wednesday, officials said.

Author Susan Abulhawa slammed the two Israeli Embassy staffers after they were murdered in D.C., accusing them of supporting Israel's "holocaust" in Gaza.

Authorities reviewing writings tied to DC shooting suspect accused of killing Israeli Embassy staffers outside Jewish museum.

Slain staffer Yaron Lischinsky had purchased an engagement ring and was planning to propose to his colleague Sarah Milgrim.