"Authorities on Sunday said lava flow on the Big Island of Hawaii had advanced about 250 yards since Saturday morning. The flow front had entered a cemetery and was about a half-mile from Pahoa Village Road, the town's main street.

"Residents in the flow path, in the mostly rural region of Puna, were told to complete all necessary preparations by Tuesday for a possible evacuation.

"The lava flow now threatening Pahoa, the largest town in Puna, began in June."