The 53-year-old bus driver who slammed a tour bus near Taoyuan International Airport in Taipei back in July, killing 26 people, was suicidal, according to law enforcement investigators.

Over the weekend, investigators concluded that the bus driver Su Mingcheng deliberately set the bus ablaze, killing himself and everyone on board. A total of 26 people were killed. Among them, 24 were from the mainland. 

Su had purchased gasoline from a petrol station half-way through the bus’ tour around Taiwan. Faced with the imminent jail time for convicted rape, Su is believed to have poured gasoline on his seat and around the exit in a horrific act of murder and suicide. Footage of the resulting blaze spread online soon after.