Hawaii authorities are telling residents near an active lava flow to prepare for a possible evacuation in the next three to give days.

Hawaii County Civil Defense said Saturday officials are going door-to door to keep residents informed of the lava's movement.

The agency says the lava crossed a country road on the edge of Pahoa town at 3:50 a.m. It's currently moving northeast toward the Pahoa cemetery and the town's main road at about 10 yards per hour.

Burning asphalt is generating some smoke.

Kilauea volcano on the Big Island has been erupting continuously since 1983. Most lava from this eruption has flowed south. But the lava has flowed to the northeast over the past two years.

The current flow threatening Pahoa town began in June.