A fire that broke out just before midnight Sunday at the Subway restaurant at 460 E. Main Street in Pullman has been ruled arson by a joint fire investigation task force in Pullman. Pullman Deputy Fire Marshal Tony Nuttman said the task force went through the charred evidence most of the morning and were able to determine there were apparent multiple points of origin of the fire. They also found examples of several possible ignitable liquids that have been collected by law enforcement and will be sent to the state crime lab.