A runner tapes a sign combining a Boston Red Sox logo with a yellow ribbon on a corner street post where Massachusetts Street intersects another roadway, April 15, 2013, in Seattle.

BaxterHolmes tweets, "The @chicagotribune devotes the cover of its sports section to Boston today: (cc @richarddeitsch @romenesko)"

Reginald Bohannon, of Atlanta, runs along Peachtree Street in an organized moment of silence and memorial run to show solidarity with victims of the Boston Marathon bombings, April 16, 2013, in Atlanta.

Mike Hayes tweets, "A message from New York to Boston projected on Brooklyn Academy of Music http://instagram.com/p/YJbQeygCFP"

Mike Hayes tweets, "Brooklyn loves Boston. photo: @stopmotionsolo"

Members of the Houston Astros including Chris Carter, center, observe a moment of silence for the victims involved in an explosion at the Boston Marathon prior to the baseball game against the Oakland Athletics, April 15, 2013, in Oakland, Calif.

Phoenix Coyotes' Keith Yandle, who is from Boston, skates on the ice with "Pray For Boston" on the inside his left skate as a tribute to those victims of the bombing at the Boston Marathon in the third period during an NHL hockey game against the San Jose Sharks, April 15, 2013 in Glendale, Ariz.

A Phoenix Coyotes fan holds up a sign as a tribute to the victims of the bombing at the Boston Marathon in the second period during an NHL hockey game, April 15, 2013 in Glendale, Ariz.

Peace is written on the sidewalk in front of the Richard house in the Dorchester neighborhood of Boston, April 16, 2013.

Shane Magness, a student at Oklahoma Christian University, bows his head in prayer for the victims of the Boston Marathon bombing, at the Oklahoma City National Memorial in Oklahoma City, April 15, 2013.

Runner Megan Cloke pauses after placing flowers on the doorstep of the Richard house in the Dorchester neighborhood of Boston, April 16, 2013.