Police are looking for a Michigan family of four who mysteriously disappeared after the father started acting "paranoid" last weekend.

According to ABC7, no one has seen or heard from Anthony "Tony" John Cirigliano, 51; his wife, Suzette Lee Cirigliano, 51; and their two sons, Noah Alexander Cirigliano, 15; and Brandon Michael Cirigliano, 19, who both have autism, since October 16.

The Fremont Police Department said the family "unexpectedly" left their home in Fremont in California's San Francisco Bay Area. 

Police noted that the family is believed to be traveling in a silver 2005 Toyota Sienna LE minivan with Michigan license plates reading DJL1982. The Fremont Police Department is leading the investigation with the assistance of the Michigan State Police.

Authorities said the family turned off all their cell phones and left behind their pets and Suzette's elderly mother, who has dementia and requires full-time care.

The Michigan family's grandmother, who lives with them, was found lost in the neighborhood on October 17, and the police could not bring her back to her family. Tim Rodwell, the Fremont Police Chief, said other family members are now taking care of her.

"They're all very concerned that Tony and Suzette and the boys have not been in contact with anyone," Rodwell told WZZM.

READ NEXT: Missing Family Survives 34 Days in the Jungle by 'Eating Berries' 

Police Released 911 Call of Father Before the Michigan Family Vanished

The Fremont Police Department released Anthony Cirigliano's 911 call the day he and his family were last seen.

According to WZZM, Cirigliano called 911 at around 12:40 a.m. on Sunday and asked for immediate police protection as he had information about September 11.

"It is of vital national interest," Cirigliano calmly told a dispatcher during the call released to WZZM.

He claimed that there were people who wanted to "erase" him "from the face of the earth." He went on to say that he was a Christian and not crazy.

"Mr. Geeting [Fremont police sergeant Jon Geeting] knows me... I just need some help. And then the U.S. government will take it from here. I know this sounds crazy. You don't have instructions for this. Please send someone that knows Geeting and can talk to U.S. authorities, please," he noted.

The dispatcher said Cirigliano had no weapons at the time of the call. He asked for Geeting to come to his home with the police lights off to not frighten his children.

The Michigan family went missing after police responded to the Ciriglianos' home shortly after midnight on October 16.

Missing Michigan Family Seen at a Gas Station

The Michigan family was spotted at a gas station on Monday. Crime Online reported that the family was spotted at a BP gas station in Gulliver, Michigan.

The Fremont Police Department confirmed that the family was there early Monday, and one of the children tried to place a call but was unsuccessful.

"They all describe this as extremely abnormal behavior from Tony and Suzette. We don't see any signs of violence. We don't see any signs of foul play right now. There are no signs of struggle inside the home," Police Chief Tim Rodwell told WOOD.

Anthony was described as 5 feet 6 inches tall, weighing 180 pounds, and with dark hair. Suzette is 5 feet 9 inches tall, weighs 120 pounds, with blond hair and glasses.

Brandon is 5 feet 8 inches tall and weighs 120 pounds, while Noah is 5 feet 6 inches tall and about 120 pounds. Both have brown eyes and brown hair.

The Fremont Police Department is asking anyone with information on the family's whereabouts to contact them at 231-924-2100.

READ MORE: Texas Twins Escape House of Horrors Where They Were Forced to Drink Own Urine and Eat Own Feces 

This article is owned by Latin Post.

Written by: Bert Hoover

WATCH: Michigan Family Of 4 Missing After 'Abnormal' 911 Call - From NBC News