A well-known pub and seafood restaurant suffered severe fire damage early Friday morning with three people treated for injuries, police said Saturday. Authorities responded to DP’s Pub and Seafood Grill on River Drive in Garfield for a report of a fire at 2:35 a.m. Friday morning, Garfield police said Saturday. The fire was reported to be on the first floor of the restaurant. Officers evacuated two residents from an apartment on the second floor of the building as well as other residents in surrounding buildings. Area fire departments responded to a second alarm and the fire was under control …