Officials say search and rescue operations have ended in Montecito, where mudslides have killed at least 20 people.

Santa Barbara County Sheriff Bill Brown says authorities transitioned Sunday morning to a search and recovery phase.

Brown says the move allows authorities to release resources that are no longer needed and slow down search operations to a safer pace.

The number of fatalities in Tuesday's flash flood is now 20. Four people remain missing.

In other news, Amtrak is adding rail cars to each of its five daily roundtrip trains between Los Angeles and Santa Barbara to accommodate commuters grappling with the ongoing closure of highway 101.

Transportation officials say the freeway will remain closed indefinitely as crews struggle to remove mud, boulders and crushed cars that filled lanes.

Many residents still haven't been able to return to their homes to check the damage. As of Sunday afternoon, officials had completed only 35 percent of their assessments of residential and commercial structures. But the Santa Barbara County Office of Emergency Management released an interactive web map that lets property owners see the damage assessments that have been done.

On Wednesday, the county will open a recovery and assistance center at Calvary Chapel Santa Barbara. It will be open from 11 a.m. to 6:30 p.m. on weekdays and from 10 a.m. to 2 p.m. on Saturdays.