A Connecticut Obamacare exchange worker has admitted to taking personal information about enrollees out of the office, information that was found in a backpack left on a Hartford street last week, officials said. The worker, an employee of the exchange's call center vendor Maximus, has been suspended as officials continue investigating the breach related to about 400 insurance plan enrollees. It is believed to be Obamacare's first-ever breach of enrollees' personal data. "While we are still working to understand exactly why this person took the information out of the building, based on what we have learned so far, it does not appear there was malfeasance on the part of this person," said Jason Madrak, chief marketing officer of the Access Health CT exchange. Read MorePossible first Obamacare ID theft

Maximus, in its own statement Monday, said that an investigation "has led us to believe that this was an incident where there was no malicious intent." "At this time, Maximus has no reason to believe that any of the information in the backpack has been misused," the company said.

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Access Health CT has scheduled a 2 p.m. ET press conference Monday to provide an update about the situation. Officials last Friday revealed that earlier that day a backpack was found on Trumbull Street in downtown Hartford, the same street where Access Health CT's offices are located. Inside the backpack were four notepads containing "a combination of handwritten names, Social Security numbers and birth dates for approximately 400 individuals," said Madrak. He said that fewer than 200 Social Security numbers were on the pads. Read MoreObamacare fines expected to drop in '16

"The owner of the backpack came forward on his own, after hearing about the discovery of the backpack on local TV news on Friday evening," Madrak said. "As the investigation continues, this individual has been placed on administrative leave and has had all system access privileges revoked," he said. The notes found on the pads are consistent with the kind that are sometimes made by call center representatives when they service clients in the enrollment process, according to Madrak.