NEW : CNN 's David Wilkinson and Alan Silverleib contributed to this report . Police identify four more victims of the shootings . Police name name twin brother of alleged killer as one of the victims . DNA tracing photographs taken by suspect Derrick Bird . Cordons found at most crime scenes .
NEW : Police identify four more victims of the shootings . Police name name twin brother of alleged killer as one of the victims . DNA tracing photographs taken by suspect Derrick Bird . Cordons found at most crime scenes .