WASHINGTON (Reuters) - The man who shot a policeman in Philadelphia and claimed to have pledged allegiance to Islamic State militants does not appear to be a mosque-going Muslim, a senior official at the largest U.S. Muslim advocacy group said. "At this hour, it does not appear that he was an observant or mosque-going Muslim" in the local community, said Jacob Bender, executive director of the Philadelphia Chapter of the Council on American-Islamic Relations. "I've called numerous imams and mosques to try to see if the name rings a bell with anyone. So far it hasn't," he told Reuters in...