Suspect Elias Rodriguez, 31, allegedly shouted “Free, free Palestine” after the Wednesday night's deadly shooting at the Capital Jewish Museum in Washington D.C.

The Department of Justice is investigating the Washington, DC, shooting that killed two Israeli Embassy staffers as an act of terrorism and a hate crime, as details continue to emerge about the violent act,

Two Israeli embassy staffers were killed in a shooting outside a Jewish museum in Washington, D.C. on Wednesday evening, with the suspect, Elias Rodriguez, charged with two counts of first degree murder and other criminal counts Thursday afternoon.

Two people were shot dead outside the Capital Jewish Museum in Washington, D.C., where the American Jewish Committee was hosting an event.

When Adam Zimmerman chaperoned his son's fourth-grade class field trip to the natural history museum in Washington on Wednesday, he didn't give a second thought to security.

Identifying who will go from anger to violence is like "trying to find which piece of hay is going to become a needle," one expert said.

The killings of Yaron Lischinsky and Sarah Lynn Milgrim are being investigated as a possible hate crime, authorities said. Elias Rodriguez, 31, is in custody.

U.S. authorities called the shooting outside the Capital Jewish Museum in Washington, D.C., an "act of terror" and identified the suspect as Elias Rodriguez, 31, of Chicago.