DENVER (CBS4) – A fire broke out at a Mexican restaurant in Denver for the second time this year.

The fire started before sunrise at the Urban Sombrero, located at 16221 E. 40th Ave.

Fire investigators said a fire at the restaurant in June that did tens of thousands of dollars in damage was a case of arson. At the time manager Robert Greco thought the man who faces charges of bombing a Borders bookstore in Lakewood was responsible.

Fire investigators are trying to figure out what caused the restaurant to catch fire, but don’t believe it was suspicious in nature.