KATHMANDU: The police on Monday arrested Suresh Tamang, 13, hailing from Phulasi VDC-6 of Ramechhap, for sexually assaulting an 8-year old girl. The accused had molested her at her room in Madhyapur Thimi Municipality-12 at around 7.00 pm on Sunday, the police said. The victim is undergoing treatment at TU Teaching Hospital in Maharajgunj.