ARLINGTON, Wash. -

A Federal Emergency Management Agency spokesman says three disaster relief centers have opened in Snohomish County to provide "one-stop shopping" for those affected by the March 22 Oso mudslide.

FEMA spokesman David Mace told reporters Monday evening that FEMA workers as well as Washington state representatives will provide face to face counseling and assistance at the centers in Arlington, Darrington and the Oso fire station.

Mace says more than 220 people seeking individual assistance have registered so far with FEMA.

The Snohomish County medical examiner's office said Monday the landslide death toll stands at 33. The sheriff's office says 12 people are listed as missing.

In other developments, Rick LaHusen of the U.S. Geological Survey says instruments newly placed on the landslide mass and nearby hillside provide "real time" measurement of even tiny earth movements. He says so far, scientists have seen "nothing that gives us any concern." Crews continue to search the slide area for more victims.