The two brothers suspected in the Boston Marathon bombings, who police say engaged in a gun battle with officers early Friday after a frenzied manhunt, were not licensed to own guns in the towns where they lived, authorities said on Sunday. But neither brother appears to have been legally entitled to own or carry firearms where they lived, a fact that may add to the national debate over current gun laws. Tamerlan Tsarnaev, 26, who was killed in the shootout with police, would have been required to apply for a gun license with the local police department where he lived...