A man watches police investigate a fatal accident on Roosevelt Boulevard in the Olney section of Philadelphia on Tuesday July 16, 2013. Philadelphia police are investigating whether cars may have been... more 
A man watches police investigate a fatal accident on Roosevelt Boulevard in the Olney section of Philadelphia on Tuesday July 16, 2013. Philadelphia police are investigating whether cars may have been drag racing when a mother and two young sons were struck and killed attempting to cross a busy highway. The woman's two other sons ages 4 and 5 are in critical condition. (AP Photo/ Joseph Kaczmarek) less 
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Associated Press | Photo By Joseph Kaczmarek
Wed, Jul 17, 2013 7:03 AM EDT