In April 1956, the department issued a multi-state alert for a person described as a skilled mechanic, with access to a drill press or lathe (for its ability to thread pipe), who posted mail from White Plains, was over 40, and had a "deep-seated hatred of the Consolidated Edison Company". A warning circular picturing a homemade pipe bomb similar to the bomber's was distributed. Police distributed samples of the bomber's distinctive printing and asked anyone who might recognize it to notify them. A review of drivers' license applications in White Plains, the city favored by the bomber for posting his mail, found similarities in 500 of them to the bomber's printing; the names were forwarded to the NYPD for investigation.