This has me scared, very scared, for some reason...the randomness of it, the total randomness of the people that are being killed...doing ordinary daily things. I don't know...

'All There Was . . . a Loud Boom' (washingtonpost.com) Despite the crowds, the culprit apparently managed to avoid standing out, slipping away each time without attracting notice. There were no visible confrontations, no words spoken.
Millhouse said he couldn't tell where the bullet came from. Nor did he see anyone running or driving away. "I saw nobody. No cars speeding, nobody running, nothing. All there was was a loud boom."