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By: Susannah Cullinane and Sheena Jones, CNN

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(CNN) — A fast-moving lava flow from Hawaii’s Kilauea volcano forced yet more residents out of their homes Sunday evening, with an emergency alert calling for immediate evacuations.

Hawaii County Civil Defense told residents of sections of the Leilani Estates community to leave their homes.

The agency said the latest evacuations were due to activity from fissure 7, one of 24 cracks in the ground that have opened in the island’s East Rift Zone since the start of the month.

PAHOA, HI – MAY 27: Lava from a Kilauea volcano fissure advances up a residential street in Leilani Estates, on Hawaii’s Big Island, on May 27, 2018 in Pahoa, Hawaii. Lava from the volcano also flowed to a geothermal power plant today raising fears that toxic gas could be released if wells are breached by lava. The Big Island, one of eight main islands that make up Hawaii state, is struggling with tourist bookings following the Kilauea volcano eruptions, with summer bookings at the island down 50 percent. Officials stress that the eruptions have thus far only affected a small portion of the island. (Photo by Mario Tama/Getty Images)

The U.S. Geological Survey said Sunday that fissure 7 was “very active, producing a large spatter rampart over 100 feet tall from fountains reaching 150-200 feet.”

The USGS warned that magma was still flowing into the rift zone.

“Additional ground cracking and outbreaks of lava in the area of the active fissures are possible. Residents downslope of the region of fissures should heed all Hawaii County Civil Defense messages and warnings,” it said.

Volcanic gas and ashfall

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Volcanic gas emissions also remained very high, the USGS said. “Trade winds are expected to diminish Sunday evening, which could expand the area impacted by vog,” it said in a statement.

Vog — or volcanic smog — is a haze created when sulfur dioxide gas and other volcanic pollutants settle with moisture and dust. It can cause respiratory illness.

A decrease in trade winds could also see ashfall in communities around the Kilauea volcano’s summit, with ash continuing to erupt from a crater there, the USGS said.

At noon Sunday, an ash column reached nearly 10,000 ft, it said: “Additional explosive events that could produce minor amounts of ashfall downwind are possible at any time. Volcanic gas emissions at the summit remain high.”

Geothermal plant

Hawaiii County Civil Defense said earlier Sunday that lava had reached the Puna Geothermal Venture Plant, covering a well.

“Lava flow from Fissures 7 and 21 crossed into PGV property overnight and has now covered one well that was successfully plugged. That well, along with a second well 100 feet away, are stable and secured, and are being monitored. Also due to preventative measures, neither well is expected to release any hydrogen sulfide,” it said.

As of Friday, the oozing lava had destroyed 82 structures on the Big Island, Hawaii County Civil Defense Administrator Talmadge Magno said.

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About 2,200 acres had been covered in lava since the Kilauea volcano eruptions began May 3, Magno said.

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