A new report from the Center for Public Integrity details how the materials were stolen from the back of a rental car while parked overnight at a hotel last year. The theft was previously unannounced by the FBI or the San Antonio police.

According to the Center for Public Integrity report, two Department of Energy specialists drove to San Antonio to pick up nuclear material from a research lab and transport it to an Idaho lab.

But before they were able to complete the mission, radioactive material that they brought with them to calibrate radiation detectors was stolen from their vehicle while they stayed at a hotel in a high-crime area on their trip to Idaho.