Our reporter, John Branch, joined a team installing cameras in the Sierra Nevada for detecting wildfires. Artificial intelligence is used to sift through images from the network, helping firefighters identify and respond to early to signs of wildfires.

Waves from Post-Tropical Storm Rachel crashed into beachfront homes in Long Beach, Calif. over the weekend, prompting evacuations.

Two Democratic candidates choose opposite tacks on public safety and policing, seeking to corral undecided voters.