BOSTON (WHDH) -- The city of Boston has cited property managers after inspectors found more than 100 rats in two apartment buildings in a Fenway neighborhood.

City inspectors called it one of the worst rat infestations they've seen in a long time.

It began when people in the area complained about the rodents.

When city workers went to investigate Wednesday, they found more than 50 burrows of rats at two properties. There is evidence the rats are migrating to nearby areas.

Experts said conditions were ideal for the rats to thrive.

“Rats all over the place, trash, I only assume there were two or three barrels overflowing; the ones in the back weren’t being used. The ones in the back were literally just jumping like it was monkey bars. They were all over the place,” said John Meaney, Director of Environmental Services Department.

"There's a responsibility of the management company to make sure these are safe and sanitary conditions that people live in," said Mayor Thomas Menino.

Owners of both properties have been cited. They’ve been ordered to hire a pest management company, clean their trash storage areas and trim the landscape.