WASHINGTON -- Nearly half of the guns that crossed state lines and were used in crimes in 2009 were sold in just 10 states, according to a report being released Monday by a mayors' group. Those states accounted for nearly 21,000 guns connected to crimes in other states, said the survey by Mayors Against Illegal Guns, an association of more than 500 mayors led by New York's Michael Bloomberg and Boston's Thomas Menino. The Bureau of Alcohol, Tobacco, Firearms and Explosives traced more than 145,000 guns used in crimes in 2009 and found that more than 43,000 of those weapons...