At least six fires occurred in September and October, and 15 have been reported so far this year.
Further USPS investigations showed that potential causes included failed fuel system components and overloaded wiring.
No mail carriers have died in the fires. At least one letter carrier was hospitalized with smoke inhalation, according to a reportlast year in the North Andover, Mass., Eagle-Tribune. Although the Postal Service warned its employees not to, drivers sometimes have risked injury by trying to save the mail inside a burning truck. At times passers-by have helped.
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