FRENCHTOWN TOWNSHIP, MI -- A 48-year-old mother is accused of attempted murder after sheriff's officials say she tried to light her 11-year-old son on fire at a cemetery.

According to the Monroe County Sheriff's Office, Sherri Richter of Frenchtown Township, bound her son's wrists about 11:30 a.m. Tuesday and placed him in a 2014 Ford Focus parked at Roselawn Memorial Park cemetery n LaSalle Township.

"The mother ignited a fire in the trunk of the vehicle with the boy still inside," Monroe County sheriff's officials said in a statement Thursday. "The mother later attempted to ignite a fire using gasoline inside the passenger compartment where the boy sat.

"This fire did not ignite while the boy struggled to free himself from the vehicle. The mother then freed the boy from the vehicle and they walked away until locating an employee from the cemetery."

A cemetery employee helped free the boy from his bindings.

After taking Richter to the hospital for an examination, she was jailed. Monroe County prosecutors charged her with assault with intent to murder and arson.

Richter was arraigned Thursday and in lieu of a $100,000 cash or surety bond.

Sheriff's officials didn't say what they believe motivated the mother to try and kill her son.