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WASHINGTON, DC (WUSA9) --Three months after the Navy Yard shootings, there are big new questions about the safety of workers and visitors at thousands of federal buildings in D.C. and across the country.

A new report from the Government Accountability Office finds contract guards have not been trained to respond to active shooters. Some have not even been trained on the metal detectors.

When Aaron Alexis opened fire at the Navy Yard, seconds mattered. Police had to respond without hesitation. But Alexis was able to kill an armed contract security guard, and use the guard's weapon to kill even more people.

Now the GAO is out with a report that questions training for contract guards at almost 10,000 federal facilities.

Officials at five different guard companies told investigators their employees had not been trained on how to respond to an active shooter.