New type of flare gun used by police.

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Inspecting new riot guns at police headquarters
G-men get rid of old guns.
Police mount guard over own arsenal. L-R: John H. Cloran / Francis J. McNeil / Edward J. Siebold.
With the latest guns, Boston police will fear nothing. The 'Reds' will be met severely in case the start anything.
Lt. Lutz is ready with men and machine guns if any May Day riots occur
Boston Police train with riot guns.