A two-alarm fire heavily damaged a Revere restaurant early Monday, the Fire Department said. A grease fire broke out at about 3:30 a.m. at the International House of Pancakes on Squire Road and was centered in the ductwork, the department said on its Facebook page. Firefighters were able to contain the fire in the ducts. The cause is under investigation. No injuries were reported.John R. Ellement can be reached at firstname.lastname@example.org. Follow him on Twitter @JREbosglobe.