in a matter of minutes , the police dispatcher keyed her mike and announced to all patrol cars in the dallas metropolitan area : attention all units , attention all units bolo for two vehicles stolen from police impoundment , one 1956 white over blue two-door bel-air chevrolet , texas license crt-045 , expired march 1963 and one black 1949 four door ford mainline sedan , texas license bry-356 , expired july 1962 , direction of travel unknown at this time .