A 13-year-old boy, apparently suffering from a mental problem, was arrested for the death of a five-year-old girl who was placed in a sack in San Jose del Monte City, Bulacan on Saturday night. Supt. Fitz Macariola, city police chief, said Mark Allister del Rosario, of Verde Heights Subdivision, Barangay Kaypian, in the city, was seen in a CCTV footage with the victim Mariel Cruz, his neighbor, hours before the child’s body was found in a secluded area at about 7:50 p.m. The victim’s hands were tied with a cable wire and a bag strap apparently was used to strangle her. “I noticed that he was very mad and angry when he killed the victim. Looks like he has psychological problem,” Macariola said. He said del Rosario will be turned over to the Department of Social Welfare and Development and will be detained at a Boy’s Town detention cell in Malolos City. Appropriate charges will be filed against the boy.