Listen to dispatch chatter from the California Highway Patrol around the time of the shooting at 8:20 a.m. Tuesday. Follow the transcript below. Source: radioreference.com.

CHP dispatch recording file 1:

11:18 --11:30

Officer: Keep talking to him, find out what's going on

Dispatcher: Can you confirm 19-241 was shot

12:30 -- 12:50

D: No one else has been 97 (arrived) yet

O: 10-4. Was there description of a subject, suspect or anything like that

D: Negative. He just said an officer was down ... We're checking to see if the witness had any description

14:00 -- 14:15

D: Officer down

14:58 -- 15:50

D: Copy. They're doing CPR

O: You get an ETA on that ambulance

D: Southbound on North Main in heavy traffic

O: I wasn't able to let the Lt. know that I was en route. Would you advise him we're going to need to call the shooting team

CHP dispatch recording file 2:

2:06 -- 2:10

D: Walnut Creek PD has the freeway shut at South Main

6:50 -- 7:48

D: Hard closure for Caltrans

Can you assist the CoCo area, the north end, they're trying to turn traffic around, they're working an 11-99 (Officer needs help)

They need a hard closure at Rudgear, they need to turn people around from South Main