PIMA COUNTY, Ariz. -- The search for 84-year-old Nancy Guthrie, the mother of "Today" host Savannah Guthrie, began after she was abducted from her home near Tucson, Arizona, on Sunday, Feb. 1, authorities said.
The Guthrie family has made multiple public pleas for any information surrounding their missing mother.
The FBI last week released photos and videos of an armed person in a mask in front of her home, appearing to tamper with a security camera.
Anyone with information is urged to call 911 or the Pima County Sheriff's Department at 520-351-4900.
Investigators believe Nancy Guthrie was abducted in her sleep early on Feb. 1, according to the sheriff's department.
1:47 a.m.: Nancy Guthrie's doorbell camera disconnected, the sheriff said.
2:12 a.m.: The camera software detected a person on camera, but no video is available, the sheriff said.
11:56 a.m.: Relatives responded to Nancy Guthrie's home and discovered she was missing, the sheriff said.
12:03 p.m.: The family called 911, the sheriff said.
Click here for a full timeline of the case.
The rewards for information leading to Nancy Guthrie or her captor now total more than $200,000 following an anonymous donation on Wednesday, according to the Pima County Sheriff's Department.
An anonymous donation of $100,000 to 88-CRIME increased the program's reward to $102,500, the sheriff's department said. That's in addition to the FBI's $100,000 reward.
The FBI has reached out to Mexican authorities to make them aware of Nancy Guthrie's disappearance, law enforcement sources told ABC News.
There is no evidence she was taken across the border, but it's an avenue investigators are exploring given the proximity to Tucson, Arizona, the sources said.
-ABC News' Aaron Katersky and Luke Barr
Pima County Sheriff Chris Nanos told Phoenix ABC affiliate KNXV on Tuesday that the motive for Nancy Guthrie's abduction remains unknown, and investigators don't know if it was a kidnapping or a burglary gone wrong.
When asked if there is any evidence that Guthrie is alive, Nanos said there's been no evidence that she is not alive.
Nanos also said that the two men who were briefly detained as part of the investigation are not suspects.
The sheriff said he believes authorities have received over 30,000 tips.
The FBI ran DNA from a glove found during a roadside search through the national database known as CODIS, and did not get a match to any of the roughly 22 million samples in the database, according to the Pima County Sheriff's Department.
That glove -- which was found about 2 miles from Nancy Guthrie's house -- also did not match DNA found at Guthrie's property, law enforcement sources told ABC News.
The DNA found at the property is being analyzed and further testing needs to be done on it, the sources said.
