The South Jakarta District Court convicted Neil Bantleman and Ferdinant Tjiong yesterday of violating Indonesia's Child Protection Law and Criminal Code.
Bantleman, who was arrested last July, pleaded innocent to the charges that he sexually abused three kindergartners at the Jakarta Intercultural School. He said he would appeal the verdict.
"Today is completely a miscarriage of justice," Bantleman said. "I'll keep fighting."
The three-judge panel also ordered Bantleman, 45, to pay a fine of approximately USD 7,700 or serve six more months in jail.
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The parents of one of the children have sued the school for alleged negligence and are seeking USD 125 million in compensation.
The principal and a number of other teachers have said they believe Bantleman is innocent.
Tjiong, who was tried separately, was given the same prison term and fine.
The school is attended by children of foreign diplomats, expatiates and Indonesia's elite. It has 2,400 students aged 3 to 18 from about 60 countries.
In December, four male janitors at the school were sentenced to eight years in prison in the same case and a female janitor received seven years as an accomplice. A sixth suspect in that group allegedly committed suicide while in police custody.