'Depose,' 'Deny,' 'Defend' reportedly written on shell casings in slaying of UnitedHealthcare CEO

The video covers the fatal shooting of United Healthcare CEO Brian Thompson, described as an ambush. The suspect waited for Thompson and shot him multiple times. NYPD sources revealed that shell casings at the scene had the words 'deny, depose, and defend' inscribed on them. A manhunt is underway, with police focusing on a distinctive backpack seen in images of the suspect fleeing on an E bike.

What type of vehicle was the gunman seen using during his getaway?

What distinctive item do police hope will help identify the gunman?