A man undergoes surgery after being found injured in a field. The Sarnia Police Service (SPS) responded to the 900 block of Confederation Street after an emergency call just before 7 a.m. Saturday. Police said a 48-year-old man was found unconscious and critically injured in a grassy field. The injuries appear consistent with the man having been assaulted. The man was taken to a London hospital, where he was admitted for surgery. The investigation is ongoing and police are trying to identify any witnesses or suspects in the case. Anyone with information is asked to contact SPS at 519-344-8861 ext. 5300 or Crime Stoppers at 1-800-222-TIPS (8477).