This follows word that the family had been missing while vacationing in Mexico.
Autopsies are being performed and results are pending.
The family was vacationing in Mexico earlier this month. Missing person reports were entered into the nationwide database.
Authorities in Iowa identified the family as 41-year-old Kevin Sharp; his wife, 38-year-old Amy Sharp; and their children, 12-year-old Sterling and 7-year-old Adrianna. The family had planned to then drive about 200 miles (322 kilometers) to Danville, Illinois, to watch a basketball game Thursday, Hoyt said.
Family friend Beth Kulow says, "When I spoke to Amy last, they had changed their flights so that they could make it to the national tournament".
"The Sharps have been located. The State Department conducted an investigation, and, unfortunately, all four family members were found deceased in their condo in Mexico".
Peterson updated her original post hours later with the news of the family's death. "Right now that is all the details we have", household buddy Ashli Peterson created on Facebook Friday.
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Peterson wrote there has been no contact from the Sharps since March 15, when they notified their relatives that they made it to Mexico safely.
Amy Sharp's sister, Renee Hoyt, told the Creston News Advertiser that the last anyone heard from the Sharps was on the 15th. "That is the last interaction she made".
The family went missing on Wednesday, according to a Facebook post from a family member.
The day after the Sharps left, the U.S. State Dpartment issued a travel warning for Americans to "exercise increased caution" when traveling in Mexico because of violent crime.
Breach, a correspondent for Mexican daily La Jornada in the state of Chihuahua, on the USA border, was a celebrated investigative journalist known for hard-hitting reports on links between politicians and organized crime. A KCCI reporter posted a photo of the Sharp family at a Chiefs game.
Mexican news outlet Noticaribe has named the resort they were staying at as the Grand Bahia Principe.