Air ambulance vendors who transport patients to Oregon Health & Science University decided not to land at the hospital on Saturday night, a hospital spokesperson said, a precaution while a flyer circulated encouraging people to shine lasers at helicopters .

The flyer, posted anonymously last week to a blog that describes itself as an “anarchist counter-info platform” in Portland, encouraged people to play “laser tag” with helicopters on Saturday. Shining lasers at aircrafts is a federal crime.

“Every night for weeks we are forced to listen to the threatening rhythm of helicopter blades as the federal regime spies on us,” the flyer said. “The only limit power knows is our refusal to submit.”

Government helicopters have kept watch on the South Waterfront Immigration & Customs Enforce

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