reporter: joanna cloonan says a woman was driving the white car with a man in the passenger seat. i want to find them and i want there to be justice to be served for my son. reporter: david, you can see the memorial growing behind me, just above the freeway here. people continuing to come to honor aiden s life. and now his family is offering a $50,000 reward for anyone who has information that could lead to an arrest. david? lee hartung reporting tonight from california. kaylee, thank you. we move on now to the fragile cease-fire between israel and hamas. america s top diplomat on his way to the region tonight. and new images showing the widespread damage in gaza city. tens of thousands of palestinians homeless following 11 days of fighting. the biden administration working to make this cease-fire last, but also now concerned about the humanitarian crisis inside gaza. abc s matt gutman from the region again tonight. reporter: tonight, hamas defiant, parading down the streets