A 16-year-old girl arrested Sunday for allegedly dumping the body of a former classmate in the mountains in Kure, Hiroshima Prefecture, contacted her friends before turning herself in, her friends claimed Tuesday.

Earlier reports said the girl confessed to killing her 16-year-old friend and leaving her on a mountain. Police found a corpse, presumably of her friend, Saturday. Neither of the two have been identified.

According to the sources, the girl posted several messages to her friends using the popular instant messaging app Line, including words of appreciation for their support.