The battle over Denver's Flock camera surveillance system escalated Tuesday with nine Denver City Council members asking the city auditor to step in and essentially block Mayor Mike Johnston's proposed extension of a contract with Flock.

In a letter dated Oct. 25 and obtained by CBS News Colorado, the nine council members asked Denver City Auditor Tim O'Brien to not sign a five month contract extension with Flock that Johnston announced last week.

CBS

"We have serious concerns about Flock Group Inc's ethics, transparency and credibility," reads the council letter. "We do not believe the City and County of Denver should continue doing business with a company that has demonstrated such disregard for honesty and accountability."

The council members accuse Johnston of deliberately evad

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