DENVER (CBS4) – A Colorado company is now a part of the investigation into Hillary Clinton’s private email system. The FBI is looking into the security of the server she used while she was secretary of state.

A Denver company called Platte River Networks was handling the email of the secretary of state of the U.S., but it wasn’t a government account. It was a private account and it’s raising questions about security.

Last week FBI agents visited Platte River Networks which was involved in handling the Clinton email accounts. Sources related to that visit told CBS4 Investigator Rick Sallinger the company has been asked to preserve any information related to the emails involving Bill and Hillary Clinton.

The company’s website lists awards including for being among the best Colorado businesses and places to work. But Metro State University Assistant Professor of Computer Information Systems Dr. Edgar Maldonado says there are questions about what security protocols were in place.

“I would say it’s not the best choice,” Maldonado said.

The FBI would not comment on its contact with the Denver company.

The inspector general for the intelligence community had been looking into the Clinton emails. It then made a referral to the justice department which led to the FBI visit.

One issue is whether Platte River Networks could have backup copies of Clinton emails that were deleted. Classified information has reportedly been found on the private server in her home.

“i did not email any classified material,” Hillary Clinton said.

CBS4 sought a comment from Platte River Networks, but the company indicated it would have nothing to say. At this point the FBI is in the information gathering stage.

Despite the visit by the FBI, there is no formal investigation at this time. They are just trying to determine if one is warranted.