More than 750 current and former staffers at the US Department of Health and Human Services implored Secretary Robert F. Kennedy, Jr. in a letter Wednesday to “stop spreading inaccurate health information” after a shooter fired hundreds of rounds at the headquarters of the US Centers for Disease Control and Prevention earlier this month.

Nearly 1,000 Health and Human Services staffers on Wednesday signed an open letter accusing the agency’s secretary of endangering the nation’s health and the agency itself by spreading misinformation that led a violent gunman to attack the CDC’s headquarters earlier this month.