Ben Carson listens to a question during a town hall meeting at Nashua Community College in Nashua, New Hampshire, U.S., on Sunday, Dec. 20, 2015.
Bloomberg—;Bloomberg via Getty Images
Updated: January 19, 2016 4:55 PM ET | Originally published: January 19, 2016 2:59 PM EST

Ben Carson has suspended Tuesday’s campaign events after three campaign volunteers and an employee were injured in a car crash in Iowa.

According to a statement from the campaign, the van carrying the four people hit a patch of ice and flipped on its side, after which it was struck by another vehicle.

Three of the passengers are currently at Cass County Memorial Hospital in Atlantic, Iowa, while the fourth is being transported to the trauma center at the University of Nebraska Medical Center in Omaha, Nebraska.

“Dr. Carson has spoken with the family of the volunteer being transported to Omaha, as well as the attending physician,” the statement says. “Dr. Carson has cancelled all remaining campaign events today and will be traveling to Omaha this afternoon to be with the family during this difficult time.”

Some other presidential candidates tweeted their support Tuesday afternoon:

Carson has been slipping in the polls in Iowa as he faces unrest and turnover in his campaign headquarters.

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