The latest mass killing in the U.S. happened Wednesday night in Lewiston, Maine, when a man opened fire at a bowling alley and a bar, killing at least 22 people, two law enforcement officials told The Associated Press. Dozens of people were also wounded. The alert for Lewiston was made shortly after 8 p.m. as the sheriff’s office reported that law enforcement agencies were investigating “two active shooter events.” The man identified as a person of interest in a mass killing in Maine is a firearms instructor trained by the military and was recently committed to a mental health facility,...