CHINIOT - A milkman sustained critical burns when he was attacked with acid over a monetary dispute here on Monday. Mubashar Ali, a resident of Adda Phattay on Lahore Road supplied milk to a collection centre. However, when he demanded his past arrears to be paid, the collection centre employee Arif Ali first exchanged hot words with him and then threw acid on his face and chest. Resultantly he sustained critical burns and was shifted to Allied Hospital.