The U.S. Internal Revenue Service is reviewing safety and security measures in response to an “abundance” of threats and misinformation on social media about the agency and its employees, IRS Commissioner Charles Rettig said in a staff memo released on Tuesday.

Rettig said the steps include new risk assessments, monitoring perimeter security at facilities, designating restricted areas and reassessing exterior lighting and entrance security. The actions follow “an abundance of misinformation and false social media postings, some of them with threats directed at the IRS and its employees,” he said.