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While protesters were flooding the streets last spring, the FBI flew 10 secret surveillance flights over the city.

The ACLU obtained information about and footage of those flights thanks to a Freedom of Information Act request. The FBI registered the planes using shell companies, and generally flew high enough that they wouldnโ€™t have been noticed by on-the-ground observers. While the footage occasionally tracked individual cars and people, magnification doesnโ€™t enable you to see individual faces.

โ€œAt times, the cameras followed individual people walking or cars driving through the city,โ€ the ACLU reports. โ€œThere are undoubtedly situations where aerial surveillance by law enforcement is appropriate, but there should be protections against mass surveillance of people engaged in First Amendment-protected protests and gatherings.โ€

โ€œThe aircraft were specifically used to assist in providing high-altitude observation of potential criminal activity to enable rapid response by police officers on the ground,โ€ FBI spokeswoman Amy Thoreson said, according to the Baltimore Sun. โ€œThe FBI aircraft were not there to monitor lawfully protected First Amendment activity.โ€

The ACLUโ€™s report is just the latest revelation about increasing aerial surveillance. The FBI flew similar flights over other protests last year.

If you want to watch the footage yourself, itโ€™s available here โ€” all 18 hours of it.