George Metesky attacked various public locations across the city for 16 years with small bombs, justifying his crimes as retribution for an injury he received while working for ConEd in 1931. His bombs were particularly devious as they were small and planted in busy public areas like Grand Central, Penn Station, and Radio City Music Hall. About half of the bombs successfully exploded, and thankfully caused no deaths. Metesky was identified by a ConEd clerk named Alice Kelly who had been searching employee records for someone who matched the police profile based on details revealed in the bomber's letters. He was found incompetent to stand trial and was committed to a mental hospital until 1973.