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In page Assassination:

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As the 20th century dawned, the prevalence and capability of assassins grew quickly, as did measures to protect against them. For the first time, armored cars or limousines were put into service for safer transport, with modern versions virtually invulnerable to small arms fire, smaller bombs and mines.[1] Bulletproof vests also began to be used, but since they were of limited utility, restricting movement and leaving the head unprotected, they tended to be worn only during high-profile public events, if at all.[citation needed]