The son of a Boston police captain was sentenced Wednesday to 20 years in prison for an ISIS-inspired terrorist plot — three years after his father tipped off federal law enforcement. Alexander Ciccolo, 26, went by the name Ali Al Amriki. His father, Robert Ciccolo, noted his son’s admiration of the terrorist group and alerted the FBI. The younger Ciccolo was arrested in July 2015 after a sting operation in which he accepted firearms that were illegal due to an earlier conviction. He was also recorded discussing plans that involved filling pressure cookers with black powder, nails and ball bearings,...