08/11/2011 at 12:00 PM EDT
was injured after her tour bus was involved in a car accident Thursday morning in Illinois.
The singer broke her ankle in the crash, which occurred on I-70 just outside of Vandalia, Ill., her rep tells PEOPLE.
"There were five passengers on the bus, and Miranda suffered a broken ankle," the rep says. "At the time, we are told everyone will be fine."
As a result, however, the singer
, 18, has to scrap her tour, which was expected to play Wichita, Kan., on Friday, for the immediate future.
"Her tour is postponed until further notice," her rep says in a statement. "Miranda thanks everyone for their understanding and support."