As tensions eased and protests continued this past weekend in Baltimore, a small squadron of aircraft circled neighborhoods affected by the riots and other violence of April 27—providing Baltimore City Police with an eye in the sky to monitor the protests and other “possible criminal activity,” as an FBI official told the Washington Post. These aircraft (or at least some of them) were part of the FBI’s secret surveillance air force—small planes with sensors perfected for battlefield intelligence in Iraq and Afghanistan.
Source: The FBI’s secret air force watched the streets of Baltimore | Ars Technica