'Barack is smiling his smug little smile': Tweets pour in blaming Obama for police killings in Dallas
Police vehicles at scene of shootings in Dallas (CNN screen capture)

Reactions are pouring in from around the world to the shooting of 11 police officers -- 4 of whom are dead -- at a Black Lives Matter protest in Dallas. On Twitter, some blamed President Barack Obama while others simply prayed for peace.

Rep Joe Walsh threatening tweet from Dallas