A bus driver has suffered burns to his eyes and face after an an unknown substance believed to be chemicals was thrown on him south of Brisbane.
The liquid was thrown at the man through the driver's side window of the bus on Drews Rd, Loganholme, about 9.30am on Monday.
The driver was treated by paramedics at the scene and taken to Princess Alexandra Hospital.
The Queensland Ambulance Service said the substance was a "chemical irritant".
Police say no passengers were on the bus and no one else was injured in the attack.
Officers are appealing for people with dashcam or CCTV footage of Drews Rd and Jalan St between 9am and 10am to contact them.