PDATE: Christian Rivera, 24, was charged with first-degree murder in Tibbetts' death, officials confirmed Tuesday afternoon.
Authorities said that Rivera is being held on a federal immigration detainer.
8/21/2018 - FOX News is reporting that two sources are saying the body of missing Iowa college student Mollie Tibbetts has been found. A law enforcement source told Fox News the body was found in Iowa.
The 20-year-old's remains were found on Tuesday on a rural property in Poweshiek County close to the town of Guernsey, around 10 miles from Brooklyn, where Mollie vanished on July 18.
Greg Willey, the vice president of Crime Stoppers of Central Iowa, told the Associated Press that nearly $400,000 reward fund for her discovery will now become a reward for information leading to the capture of any suspects.
No arrests have been announced in connection with Tuesday's discovery.
KCRG reports the Iowa Division of Criminal Investigation is holding a 4:00 p.m. news conference.
Officials are not confirming any information at this point but say a significant amount of information will be released at the news conference.
Tibbetts vanished more than a month ago from the small town of Brooklyn, Iowa. The 20-year-old college student was last seen jogging around Brooklyn, Iowa around 7:30 p.m. on July 18.
Tibbetts' family pleaded for her safe return and had remained hopeful Tibbetts would be found alive. Her father, Rob Tibbetts, returned home to the San Francisco area after spending weeks looking for his daughter.
Last week, the FBI said they believed she had been abducted by someone she knew. They warned that the person was 'hiding in plain sight' and had even attended vigils held in her honor.