PHOENIX - With temperatures topping 100 degrees in Arizona, QuikTrip convenience stores across the state are placing warning stickers on their doors in the hope that parents will think twice before leaving pets and children in the car while the shop, the Arizona Republic reports.

"You think you??re going in (a store) for two minutes," John Gallagher, EMS medical director for Phoenix, told the newspaper. "But that may be too long."

According to a study from San Francisco State University, vehicle-related heat deaths of children reached 49 deaths nationwide in 2010. So far this year, 10 children have died after being left in hot cars, notes the newspaper.

"Parents leave just a little crack of window??and think that??s enough. That??s not enough," said Frank Salomon, a deputy police chief.

Officials urge anyone who sees a child or pet left in a car in distress to call 911.