COACHELLA, California — Holy prayers at a mosque here on Friday were canceled with families gawking behind fire lines after discovering the front of their holy house had become one big fireball. Late Friday night, authorities announced that they believe the fire was deliberately set, and the local branch of the FBI is investigating as a possible hate crime. In addition, a person of interest has been detained, but not identified. Members of the congregation are blaming GOP presidential frontrunner Donald Trump for setting the ugly tone that charred their house of worship. The mosque began to burn at around...