In the scorching summer heat, Tucson Sector Border Patrol reports a two-thirds spike in rescues -- to more than 800 -- over last year. Agents are still determining what's behind the spike.

<p>In the scorching summer heat, Tucson Sector Border Patrol reports a two-thirds spike in rescues -- to more than 800 -- over last year. Agents are still determining what's behind the spike.</p>

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