Officials in Denver began counting mailed-in election ballots Thursday using what they say is a hack-proof system.

Denver officials will not release the results until Election Day Nov. 8.

The scanners and computers used in the voting process are not connected to city or county computers. The system they use is also not connected to the internet.

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Denver Elections Director Amber McReynolds says the system can't be hacked from outside the facility, and the rooms are monitored 24/7 throughout the election process.

McReynolds added that additional security measures are in place to ensure no one gets into the system.

The voting results will be transferred on Election Day to Internet connected computers using USB drives that are secure and locked in a safe.
 

The Associated Press contributed to this report.