<http://schema.org/mainEntityOfPage>
<http://www.upi.com/Top_News/US/2013/04/16/Brothers-lose-legs-in-explosion-at-Boston-Marathon/77391366132285/>
<http://www.upi.com/Top_News/US/2013/04/16/Brothers-lose-legs-in-explosion-at-Boston-Marathon/UPI-77391366132285/>