A massive swarm of mayflies has invaded the town of Havana, Illinois, creating a slippery mess and several accidents. Havana police tell NewsChannel 4 that it’s unlike anything they’ve ever seen before. “We have mayflies but never an invasion like this,” said Officer Stark.

The swarm has its sights set on a main bridge, which has prompted the Havana Police Department to send out this warning on its Facebook page: “At one point they had piled 6 inches high and when ran over, became very slick. There were already motorcycle accidents due to this and cars stuck in the center of the bridge.” Commenters say the swarm resembles “a plague.” FULL STORY