A second Pasadena police officer is under investigation by federal authorities and is currently on paid administrative leave, a city spokeswoman said Tuesday.

Lisa Derderian, Pasadena’s interim public information officer, said the officer’s leave is related to the Bureau of Alcohol, Tobacco, Firearms and Explosives’ investigation into Lt. Vasken Gourdikian, who was indicted last week for allegedly selling more than 100 firearms without a license.

Derderian would not disclose the name of the second officer.

“Because it is a personnel matter, we cannot comment further,” she said.

Ginger Colbrun, spokeswoman for the ATF’s Los Angeles Field Division, said the Department of Justice and the ATF would not identify any officer under investigation.

“Last year, when ATF sent out the law enforcement advisory educating (agencies) on the definition of ‘engaging in the business,’ it was because Los Angeles Field Division had discovered some law enforcement officers who did not have a Federal Firearms License that were purchasing ‘off roster’ firearms and reselling those firearms to non-law enforcement entities for a profit,” Colbrun wrote in an email.

However, she said she cannot provide specifics on any of those officers or the agencies for which they work because these are ongoing investigations.

Last year, the ATF sent an advisory to Southern California police and sheriff’s departments warning of an “emerging problem” with officers buying and then reselling firearms in possible violation of federal firearm laws. The involved guns include many which are considered “off-roster” under California law, meaning they can’t be purchased at a gun shop by the general public.

Gourdikian’s indictment similarly noted that many of the firearms he allegedly sold fell within this category. Police officers in California can purchase “off-roster” firearms and can legally sell the guns to another individual as long as they aren’t flipping the weapons solely for a profit.

The officers can face additional charges for lying on federal firearms forms if they’re acting as a straw buyer.

In June, the Pasadena Police Department stopped issuing waivers that allowed officers to bypass the 10-day waiting period for gun purchases after it was discovered Gourdikian used the system seven times in a four-year period.

But Gourdikian wasn’t the only officer making use of the program. During the same period, at least 55 officers received more than 80 waivers from the department’s command staff. The majority were for off-duty use, according to the waivers.

Gourdikian made more than $191,000 from the city during the ATF’s year-long investigation into him, according to the city. Last week, police Chief Phillip Sanchez stripped Gourdikian of his pay after the indictment became public. He remains on unpaid leave.