Almost half of the passports issued to the Environmental Protection Agency's employees are missing, according to the EPA's inspector general.

Official and diplomatic passports issued to EPA employees, as well as other sensitive personal identifiable information, could be compromised as a result, the inspector general said in a report.

Of 417 passports issued to Office of International and Tribal Affairs employees, 199 could not be located, the report said.

The report said the OITA fails to "fully and accurately track and identify the location of EPA-issued passports."

OITA has no formal policies for issuing, monitoring and securing passports, according to the report. EPA hopes to have the issue corrected by September.