ALLENTOWN, Pa. -

Two Lehigh County municipalities have filed another lawsuit over Allentown's Neighborhood Improvement Zone.

Upper Saucon Township and Catasauqua have filed a class action lawsuit together, challenging the NIZ, which is the special tax zone that's funding Allentown's hockey arena project. This is the third lawsuit filed over the zone.

Bethlehem and Hanover townships in Northampton County filed a suit together in March, and Lehigh Valley developer Abe Atiyeh filed a suit in April.