Wittenberg University in Springfield, Ohio has warned students to be on high alert after someone threatened to shoot Haitians on campus, according to officials. All events and activities scheduled for Sunday have been canceled.

An alert sent to students on Saturday night said the college was taking “extreme precautions” after an email threatened a shooting on campus on Sunday, targeting Haitian members of the community.

“All students, faculty and staff should exercise extreme precaution and be alert to all your surroundings,” the university said in the alert. “If you see anything suspicious or have information about the threat, contact Wittenberg Police Division immediately at the emergency line.”

The alert added: “The Springfield Police Division will increase patrols on-campus tomorrow. If you are on or near campus, prepare for additional instructions or a lockdown if we learn more from the ongoing investigation. All activities are canceled on Sunday, Sept. 15.”