The man accused of fatally shooting two staff members of the Israeli Embassy in Washington outside a Jewish museum told police after his arrest, “I did it for Palestine, I did it for Gaza,” federal authorities said Thursday in announcing charges in the killings they called a targeted act of terrorism.

Investigators have seized writings that they believe belong to the suspect as they search for a motive in the fatal attack.

FBI agents left a property in Chicago's Albany Park neighborhood that is connected to the suspect in a deadly shooting outside the Capital Jewish Museum in Washington D.C. with boxes of evidence in hand Thursday afternoon.

The man and the woman were shot dead outside the Capital Jewish Museum near Penn Quarter, Washington DC, and police have warned members of the public to avoid the area