Then she heard gunshots and a man's screams.
Officers had shot and killed 23-year-old Zawahri.
The suspected gunman's mother released a short statement Monday night, asking for privacy.
"As may be assumed, I am in mourning for my family and for those who were also affected by this horrific tragedy over the past few days. I cannot express my great sadness for the families who are also suffering at this terrible time," Randa Abdou said in the statement obtained by CNN affiliate KABC.
"I do ask the media please give me time to grieve and to come to grips with the overwhelming sorrow that has befallen all of us."