Police in Aceh have arrested two men for allegedly raping and strangling a six-year-old girl to death.

Adj. Comr. Erlin Tangjaya, the head of the Aceh Police's detectives unit, told Indonesian news portal Kompas.com that two men, aged 20 and 19, were arrested after the girl's family reported her missing last week.

She was last seen on Friday, March 22, with a relative, identified as HSB, and his friend, identified as AM. They were reportedly taking her for a walk. Both men have since been detained at the Kuta Raja police office.

"We arrested them because they took the victim for a walk the night she went missing," Erlin said. He added that the suspects initially denied their involvement in the case.

"After a thorough investigation, we found out that they raped the child before they murdered her," he said.

AM admitted that they were planning on taking the girl home. However, on their way back, they proceeded to rape the girl and strangle her to death. They disposed of the body in a bush.

Based on the suspects' confessions, the police discovered the victim's body in Peulanggahan, Kuta Raja subdistrict, Banda Aceh, on Wednesday.

Arist Merdeka Sirait, chairman of the National Commission for Child Protection (Komnas PA), a nongovernmental organization advocating children's issues, recently declared 2013 "as a year of national emergency over child sexual abuse."

In 2010, Komnas PA received 2,046 reports of violence against children, 42 percent of which were sexual. In 2012, the figure rose to 2,637 cases, 62 percent of them sexual abuse. As of February 2013, the organization has filed more than 80 reports of child sex abuse.