A COVID-19 vaccination site in Colorado was closed after 13 people suffered adverse reactions to the Johnson & Johnson vaccine. More than 600 people were turned away from Dick’s Sporting Goods Park after it was closed on Wednesday.

Approximately 1,700 individuals were vaccinated on the day of the closure, but according to the New York Post, 13, or just under 1 percent of those vaccinated, had harsh side effects. Health officials closed the vaccination site out of an abundance of caution.

The primary side effects were nausea and dizziness, but two of those affected were taken to the hospital for further observation. State officials said that the nine others were treated with juice and water.

In a statement from the Colorado Department of Public Health and Environment released on Wednesday night, the side effects experienced were “consistent with what can be expected.”

The health department assured those vaccinated at the site previously, saying that “the state has no reason to believe that people who were vaccinated today at Dick’s Sporting Goods Park should be concerned.”

According to state health officials, the side effects such as fever or pain are normal. The decision to close the vaccination site was only a safeguard, and no reports conclude the adverse reactions are indicative of a larger problem.

The Denver Post reported that over 640 people were turned away from the vaccination site after its premature closing. Those vaccinations were rescheduled for Sunday.

Health officials confirmed that the adverse reactions were an aggravated version of side effects common to the single-dose shot. The 640 people turned away, however, will receive the Pfizer vaccine on Sunday, according to The Denver Gazette.