A new assessment on the proposed National Bio- and Agro-Defense Facility in Kansas concludes that changes in the lab’s design have sharply reduced the risk for accidental release of deadly diseases.

The assessment released Friday by the Department of Homeland Security updates a report issued in 2010. The new document puts the risk of an accidental release at one-tenth of 1%, down from the previous calculation of a 70% chance of release.

Supporters credit design changes made since the first report for the lower risk.

Homeland Security plans to build the lab in Manhattan near Kansas State University. The assessment calculated the risk to the human population living near the lab, as well as the large number of livestock in the region.