HONOLULU: Rivers of lava flowed toward the ocean on Hawaii’s Big Island over the weekend, forcing officials to knock on doors and urge residents holding out in two evacuated neighborhoods to flee right away.

Molten rock trapped at least one person who was rescued by authorities. The Kilauea volcano has been unleashing danger on the remote, rural southeastern side of the island for nearly a month, displacing thousands of residents, destroying 37 houses and forcing businesses to shut down.

A section of a key rural highway closed after a lava flow came within about 100 yards, according to the Hawaiian Volcano Observatory. The two-lane highway connects Pahoa, a small town near the evacuation zones of the Leilani Estates and Lanipuna Gardens neighborhoods, to the east coastline and links two other small highways that run north and south.

Lava was shooting up from cracks in the ground and blowing strands of volcanic glass.

Explosions at the summit were sending small bursts of volcanic ash as high as 15,000 feet.

Wind was carrying volcanic glass, gases, pollution and ash particles to other parts of the island. Authorities on Tuesday advised residents to minimize exposure to avoid irritation to skin and eyes and breathing problems.

A new fissure has opened, bringing the total number of cracks spouting lava to 24 since the volcano began erupting on May 3, Hawaii County Civil Defense said.

Lava also has covered two wells at a geothermal plant. County officials said the plugged wells were stable and being monitored.