A shark was reportedly seen feeding off the shore of Coast Guard Beach in Eastham on Sunday morning, according to local police and onlookers. Bruce Langsen, an Eastham resident who was taking beach photographs, said he saw a shark attack and devour a seal about 100 yards from the shore about 7:30 a.m. Langsen said about a dozen surfers in the water were about 40 yards from the attack but no one was hurt. A police dispatcher confirmed that a call came in Sunday morning for a shark sighting, but could not comment further. Representatives from the Cape Cod National Seashore could not be reached. Police would not say if the beach was closed after the sighting.