The Internal Revenue Service needs to take additional steps to improve security at some of its facilities, according to a new report.

Due to the nature of the IRS’s mission, the organization remains a target for those who are angry at the tax system or the government, the report noted. Threats of violence directed at the IRS’s 100,000 employees at more than 600 facilities throughout the country have increased during a time of continued financial hardship. In the one-year period between October 2010 and September 2011, there were more than 1,400 reported threat incidents directed towards IRS employees and infrastructure.