BALTIMORE (WJZ) — Since January, the city of Baltimore has been under intermittent surveillance from the sky, and the public was never told, according to a report out this week in Bloomberg Businessweek.

A small Cessna airplane equipped with cameras spent hours flying over the city, and feeding its footage back to huge hard drives, the reportsays.

The Baltimore Police Department held a press conference on the matter Wednesday afternoon, and Mayor Stephanie Rawlings-Blake put out a statement around the same time.

“I was recently made aware of the Persistent Surveillance Systems Inc. work with our city,” Rawlings-Blake wrote.

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Baltimore Police Respond To Report Of Secret Aerial Surveillance Program