The two-pronged investigation involves city of Detroit officials and demolition contractors.
Many of the fires spread to adjacent structures, and at least two rigs broke down.
Tens of thousands of dead and dying trees in Detroit are in danger of falling on houses, cars, streets, power lines and garages.
One firefighter was injured, and a puppy was saved from a burning house.
About 140 fires broke out in Detroit and Highland Park from Saturday night to sunrise Tuesday, nearly triple the number of blazes during the three-day Devils’ Night period last year.
Firefighters are bracing for what has become the most destructive three-day period for fires in Detroit – July 2-4. We’ll provide details of every fire, with videos and photos.
In the past two months, photographers in Detroit have been briefly detained, cursed at by firefighters and intentionally sprayed with water. Another photographer’s phone was smashed.
For the past three years, Motor City Muckraker photographed fires in Detroit as part of a project to reveal the widespread damage caused by the city’s arson epidemic.
An interactive map shows where each of the 10,000 fires occurred between 2013 and 2015.
At least 32 people have died in Detroit fires this year.