A record heat wave has sent more than 40 people to hospitals in Las Vegas and prompted special protection for wild horses and the cancellation of a marathon elsewhere in Nevada.
Authorities say some 30 people at an outdoor concert in Las Vegas were hospitalized on Friday afternoon for heat-related injuries when temperatures soared to 115 and tied the city's record for the date set in 1994.
Another seven people were taken to hospitals in Las Vegas with similar problems Friday, but no life-threatening injuries were reported.
Organizers also cited the heat for their decision to cancel Saturday's Running with the Devil marathon in Boulder City, 20 miles south of Las Vegas.
Saturday's daytime high was expected to reach 117 degrees in Las Vegas, which is the city's all-time high. It was 108 at noon Saturday in Sin City.
In the Reno area, federal land managers installed sprinklers in effort to reduce the heat in outside pens of the largest wild-horse adoption facility in the country.
Friday's high of 103 in Reno broke its record of 100 for the date set in 2010.
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