Where things stand

• Day 11 of the search: Arizona law enforcement officials say they’ve received more than 4,000 calls in the past 24 hours regarding the disappearance of Nancy Guthrie. The calls came after the FBI released doorbell camera footage yesterday from Guthrie’s front door taken the morning she disappeared.

Savannah Guthrie's Family Requests Police Presence at Mom Nancy's Home for 'Security'

• Detained person speaks out: A man who said he was detained yesterday for questioning and later released says he wants to clear his name. A search warrant connected to man’s property is sealed.

• New letter: TMZ reported it received a “bizarre letter” via email this morning from someone purporting to know who Guthrie’s kidnapper is and demanding a single Bitcoin for the information.

• Submit your questions: Tonight on CNN, Laura Coates will present a live one-hour special, “The Search For Nancy Guthrie.” The special will air on CNN and CNN All Access at 11 p.m. ET. Send us your questions about the case.

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FBI continues to search for evidence near Nancy Guthrie’s home. Here’s the latest

CNN staff

FBI agents were seen today scouring the rugged desert terrain surrounding Nancy Guthrie’s Tucson home as the search for the missing 84-year-old woman continues for an 11th day.

Investigators are looking into leads as they dig into thousands of tips and probe nearby areas after a recovered doorbell video showed an armed, masked individual approach Guthrie’s home.

As investigators look for evidence, here is what we know so far:

Search continues near Guthrie home: FBI agents were out on the roads in Catalina Foothills, the unincorporated community north of Tucson, Arizona, searching for any evidence they could find. At one point, CNN saw agents searching near Guthrie’s home, keeping their eyes on the dusty desert floor while navigating thick brush and cacti. A New York Post reporter even witnessed agents pick up a dark glove off the side of the road about a mile and a half from Guthrie’s home, although it’s not clear if it is the same one seen in surveillance images released by the FBI.
Looking for evidence from person in video: With a possible glove in possession, law enforcement will now try to recover from it any DNA, fiber, hair or traces of plants, CNN’s chief law enforcement and intelligence analyst says, as authorities look at the type of backpack the person was seen wearing.
Scrutinizing the doorbell video: Images released by the FBI of the armed person who approached Guthrie’s home give investigators new tools beyond what the person was wearing, including their preparedness – or lack thereof – and how the person behaves, experts say.
Tips flooding in: The Pima County Sheriff’s Department has received over 18,000 tips since Guthrie was reported missing, which leaves investigators undergoing an intensive process to figure out which tips to priorotize.
FBI investigating “persons of interest”: FBI agents are looking into “persons of interest” in relation to Guthrie’s disappearance, Director Kash Patel said on Fox last night, although he didn’t say who might be under suspicion. The sheriff’s department today said a man detained for questioning as part of “a follow-up on incoming leads” yesterday afternoon was released after speaking with investigators.