The kidnapped boy arrived at their place and asked for help, and a phone to call his mother, he was assisted with a phone and was able to call his mother, after that the guys decided to take him to the local police station.
His mom has probably alerted the cops after receiving the call and the cops would have used that to trace them, they were intercepted on their way to the police station, they protested their innocence and the kidnapped boy tried to explain to the cops that the guys were trying to help him, which fell on deaf ears as they were arrested anyway and the cops went on to announce in the media how they arrested the kidnappers and rescued the boy.
Couple of days later the guys had to be released when the NPA found there is nothing to work with as far as charging them.