The two top contenders for the Democratic nomination, former Vice President Joe Biden and Vermont Sen. Bernie Sanders, both announced Tuesday that they are canceling rallies in Cleveland due to the ongoing coronavirus outbreak.

“Out of concern for public health and safety, we are canceling tonight’s rally in Cleveland,” said Sanders campaign communications director Mike Casca.

The Biden campaign would also cancel their event for similar reasons.

“In accordance with guidance from public officials and out of an abundance of caution, our rally in Cleveland, Ohio is cancelled. We will continue to consult with public health officials and public health guidance about future events in the coming days,” a statement from Biden’s campaign said.

Ohio is an important prize for both candidates, with the state awarding 136 pledged delegates. The state will hold its primary on March 17.

Ohio Gov. Mike DeWine announced a state of emergency on Monday after three residents of Cuyahoga County tested positive for the coronavirus. Cleveland is located in the county.

DeWine has urged Ohioans to avoid large crowds and wash their hands to prevent the spread of the virus. The Ohio State University and Miami University have both suspended in-person classes amid the outbreak.

There are at least 849 cases of coronavirus in the U.S., with the death toll at 29.