4 minutes ago: Horrific traces from Nancy Guthrie’s pacemaker unexpectedly show a signal again, her location of captivity has been discovered…

(NewsNation) — The search for Nancy Guthrie has entered its ninth day, and authorities have released several pieces of evidence that still do not explain exactly what happened to the mother of “Today” show co-anchor Savannah Guthrie.

Nancy Guthrie has been missing from her Tucson home since Jan. 31. No suspect has been publicly identified, though at least two messages from individuals claiming to be kidnappers have been sent to local media.

Here is the evidence authorities have released so far regarding Guthrie’s reported abduction:

Surveillance camera removed from Nancy Guthrie’s home

A Ring camera mounted at the front of Guthrie’s home appears to have been removed, a detail investigators are now examining, Pima County Sheriff Chris Nanos said.

The camera recorded a “person on camera” alert at 2:12 a.m. on Sunday, Feb. 1. However, authorities say it is unclear whether the alert was triggered by an actual person, an animal or another cause.

Investigators are also looking into whether the missing surveillance camera was taken by a suspect.

Nancy Guthrie’s pacemaker data stopped syncing

Authorities said Guthrie’s pacemaker stopped syncing with her Apple devices at 2:28 a.m. Sunday.

Guthrie is considered a vulnerable adult, officials said, noting that she has difficulty walking, has a pacemaker and requires daily medication for a heart condition.

Law enforcement has expressed growing concern for her health due to her need for regular medication.

Blood found on porch belongs to Nancy Guthrie

DNA tests showed blood on Guthrie’s front porch was a match to her, Pima County Sheriff Chris Nanos has said.

Ransom letters sent to news outlets

Multiple press outlets have received alleged ransom letters over the past week. At least one letter included monetary demands and set deadlines for payment.

The first deadline passed last Thursday, and a second deadline was set for Monday, according to FBI Special Agent in Charge Heith Janke.

Law enforcement officials have not confirmed the credibility of the letters but said all tips and communications are being investigated.

NewsNation’s Brian Entin and Damita Menezes contributed to this story.