Authorities in two U.S. cities scoured leads in a pair of weekend mass shootings that killed 31, trying to piece together the motives that led two young men to unleash violence on innocent people in crowded public places.
Authorities in two U.S. cities scoured leads in a pair of weekend mass shootings that killed 31, trying to piece together the motives that led two young men to unleash violence on innocent people in crowded public places.