The number of suspects in a sexual abuse case at Jakarta International School (JIS) may increase as 13 of a total 28 workers employed by outsourcing company PT ISS at the school tested positive for herpes.
The police said they would investigate the circumstances in which the 13 workers contracted the disease.
"If they were infected at the school, they may be involved in the case," Jakarta Police spokesman Sr. Comr. Rikwanto said on Friday.
A total of 28 cleaners who worked at the school were tested at Kramat Jati Police Hospital last month, including the six who were arrested and named suspects in the alleged rape of a 6-year-old boy who attended the school's kindergarten.
The police announced late last month that two of the six suspects had tested positive for herpes.
"We've received the results of the blood tests and 13 more cleaners have now tested positive for herpes," Rikwanto told reporters on Friday.
The victim was reported to have contracted herpes following a sexual assault allegedly perpetrated by a group of cleaners.
He added that the police would consult the doctor who conducted the tests to investigate the findings and compare the results with the victim's diagnosis.
"We still do not know whether the 13 people who tested for herpes contracted the disease in a situation unrelated to the rape or whether they were infected by participating in the rape," he continued.
The police will further question the 13 workers to determine whether they can be suspected of raping the pupil or other victims who have not yet come forward out of fear.
Aside from questioning the workers who tested positive for herpes, Rikwanto said the police would also question JIS head of school Timothy Carr again for a third time.
Rikwanto criticised Carr for being uncooperative, which had lead to the police needing to quiz him again.