Via the BBC:
Hamelin is proud of its heritage as part of the famous story about the Pied Piper, even though the town is not portrayed positively in the story. Remember? The town tried to stiff the piper for his services, so he led all the children out of town for revenge?
The story is approaching its 725th anniversary, and Hamelin is planning to celebrate.
But out on the edge of town, there's an abandoned building where rats are taking over. The town says that they cannot step in to control the population because the building is private property (though no one seems to know who it belongs to). So they're setting traps around the periphery of the area in hopes of stopping the rats from spreading to the rest of the town.
Maybe it's just The Amazing Maurice and His Educated Rodents?