Family members of 12 of the 19 elite Granite Mountain Hotshots who were killed in the Yarnell Hill Fire last year are suing the Grand Canyon State, The Associated Press reports. The lawsuit seeks damages for funeral costs, pain and suffering, as well as lost income. The lawsuit also seeks an explanation for what specifically led to the men’s deaths.

“The families want to ensure they understand clearly what happened, why it happened and to ensure that whatever needs to be done now or in the future to avoid tragedies like this is indeed done,” Pat McGroder, a lawyer for the families, said Thursday, according to The AP.

Reuters notes that the Yarnell Hill Fire destroyed numerous homes and scorched 8,400 acres before being extinguished near Yarnell, Arizona. When all was said and done, the fire had become the deadliest U.S. wildfire since 1933.

According to Reuters, Arizona and its forestry division, Yavapai County and the Central Yavapai County Fire District are all named as defendants in the lawsuit. The fire officials who supervised the firefighters trying to contain the Yarnell Hill Fire are also named as defendants in the lawsuit.