A suspected member of an Irish Republican Army splinter group was charged Saturday with trying to kill a Northern Ireland prison officer by placing a booby-trap bomb under his vehicle as police warned of rising security risks as Easter approaches. Dozens of armed riot police were deployed inside Belfast Magistrates Court to control a rowdy crowd supporting 45-year-old Christopher Robinson, who offered no plea to two charges of attempted murder and possession of a homemade bomb. Robinson was arrested following the March 4 attack on an off-duty prison officer, who was seriously wounded when a bomb exploded beneath his van...