Stephanie McMaster
A massive tornado touched down just south of Oklahoma City on Monday, killing dozens.
At least seven of those killed were students at Plaza Towers Elementary School in Moore. The twister, which measured 2 miles at one point, has been given a preliminary classification of an EF-4 tornado (winds of 166 to 200 mph), according to weather officials.
A heart-wrenching photo of 8-year-old Martin Richard, who was killed in the Boston Marathon bombing on Monday, shows the boy holding a hand-drawn sign that says, "No more hurting people. Peace."