Los Alamos National Laboratory Wrapping Up Investigation

The Los Alamos National Laboratory is expected to conclude its probe into former employees who allowed visitors to operate weapons at the lab's shooting range.

The Los Alamos Monitor reports that the law says four unauthorized visitors were given access the range and were allowed to "operate a variety of firearms." The lab says participants also took photos of their time on the range and posted them on Facebook. Those photos have since been taken down.

Five employees of the lab security force, known as Securing Our Country, were fired last month for "inappropriate behavior" at Technical Area 72.

Officials say the investigation could wrap up as early as this week.

Information from: Los Alamos Monitor.

Copyright 2012 The Associated Press.