Police have arrested an elderly woman of Somali nationality as they investigate information received from a mysterious caller claiming that her neighbor had killed her own granddaughter. The woman caller said her neighbor repeatedly beat her granddaughter severely, and that the child's absence from view for several days had concerned her enough to alert the authorities. Police, acting on directions given by the caller concerning the street and the color of the house door, entered the premises of a Somali family who neighbors later said had been receiving guests for a funeral wake. Investigators made one arrest and are attempting to identify the caller who reported the information.