RELATED: Missing Palo Alto couple: Crews come up empty in leads after searching Tomales Bay
Marin County Sheriff's Office says they received four "independent alerts from Cadaver K9 teams" near Shell Beach along Tomales Bay.
In a statement issued by the Marin County Sheriff's Office, they write: "We've worked tirelessly combing through all leads and areas surrounding the cottage they were vacationing at and are now calling this a recovery mission. We have been in close contact with family and will continue to search for Carol and Ian. Our thoughts are with the Kiparsky and Irwin family during this difficult time.
#BREAKING: @marinsheriff now calling search for missing couple a recovery mission.— Anser Hassan (@AnserHassan) February 20, 2020
•”We have been in close contact with family and will continue to search for Carol and Ian.”
•Coast Guard chopper flew over area earlierhttps://t.co/5qrBkAlG5L pic.twitter.com/NBCc6dGTXZ
Carol Kiparsky, 77, and Ian Irwin, 72, were on a hiking getaway and staying at an Airbnb cottage in Inverness. Family members they last heard from the couple on Friday, but the Airbnb owner called police when the couple didn't check out as scheduled on Saturday.
RELATED: Search expands for missing Palo Alto couple in Marin County
On Sunday, the Marin County Sheriff's Office began searching for the couple, joined by more than 100 search and rescue volunteers.