Transportation officials have released footage showing traffic cones being thrown off the Massachusetts Avenue Bridge onto the Charles River.
The cones, part of a bicycle safety pilot program that launched in November, have repeatedly been removed from the bridge connecting Boston and Cambridge.
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The Massachusetts Department of Transportation released the surveillance footage Friday following a public records request from the NBC10 Boston Investigators.
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Last week, engineers spent hours retrieving 131 cones from the thinning ice below the roadway. The objects were also thrown onto the river back in January.
"It is a little bit of a dicey operation whenever you have ice on a river, it can be dangerous," MassDOT Highway Administrator Jonathan Gulliver said last week.
MassDOT says it's unclear why someone would do this.
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"It's hard to say," Gulliver said. "I mean, I don't know what the motivation is of somebody to just do that."
