A suspected serial chemical attacker has admitted sprinkling a mixture of bathroom cleaners on other people on 30 occasions in Bangkok over the past two months, acting city police chief Pol Maj Gen Kamronwit Thoopkrachang told a press conference Monday.

Affirming the attacks were the work of a single individual, he said Yanhee International Hospital would treat free of charge the chemical burns of all victims until their condition returned to normal.

Read more: The Nation