VALLEJO (KPIX 5) — Police in Vallejo have four people under arrest in a kidnapping-for-ransom scheme.

The ransom text sent on July 1 to John Babb of San Francisco said if he didn’t pay up, his mother would be dead.

READ MORE: Santa Clara County Officials Unveil Plan To Hand Out Free COVID At-Home Antigen Tests; Here's How To Sign Up

His mother is 57-year-old Elvira Babb who was last seen at the Seafood City Market in Vallejo not far from her house.

When her son got to her home after the text, she was gone and her dog was dead. Since that moment, the FBI, U.S. Marshalls Service and Fairfield police have been on the case to find the suspects and find Babbs.

The suspects were taken into custody late Friday night and early Saturday morning but Babbs has not been found.

READ MORE: 'Disturbing' Attack On Ducks In San Lorenzo Park Caught On Video; Arrest Made

“The victim’s been gone for over a week, so it causes it some deep concern, obviously,” said Lt. Jeff Bassett of the Vallejo Police Department. “We’re hopeful that we’ll be able to locate her alive.”

The chief suspects are Emmanuel Espinosa of Stockton, Jalon Brown and Larry Young of Sacramento and Lovely Rauzol of Vallejo.

Vallejo Police Department said Babbs was acquainted with Espinosa, but wouldn’t divulge anything further.

The suspects are all in the Solano County Jail facing charges of kidnapping for ransom charges. They’ve been interviewed, but aren’t cooperating, and detectives still haven’t found Babbs.

MORE NEWS: Liam's List Jan. 21: 49ers Playoff Showdown, New Charlie Puth Song, Fog Fair At Fort Mason

While authorities aren’t revealing the exact amount of the ransom demanded, KPIX 5 has learned it was less than $100,000.