Analysis: Two mass shootings many time zones apart shatter communities and expose fraught politics

At about 4:20 p.m. on a cold Rhode Island Saturday, a message from Brown University flashed up on cellphones all over campus — everyone should run or take cover from an active shooter.

​ At about 4:20 p.m. on a cold Rhode Island Saturday, a message from Brown University flashed up on cellphones all over campus — everyone should run or take cover from an active shooter. Read More Breaking News, Latest News and Videos | CNN