Iceland volcano erupts fourth time in 3 months | Watch video

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Met Office had warned for weeks that magma — semi-molten rock — was accumulating under the ground, making an eruption likely. Hundreds of people were evacuated from the Blue Lagoon thermal spa, one of Iceland’s top tourist attractions, when the eruption began, national broadcaster RUV said. No flight disruptions were reported at nearby Keflavik, Iceland’s main airport.

The eruption site is a few kilometers (miles) northeast of Grindavik, a coastal town of 3,800 people about 50 kilometers (30 miles) southwest of Iceland’s capital, Reykjavik, that was evacuated before the initial eruption in December. A few residents who had returned to their homes were evacuated again Saturday. Grindavik was evacuated in November when the Svartsengi volcanic system awakened after almost 800 years with a series of earthquakes that opened large cracks in the ground north of the town.

The volcano eventually erupted on December 18, sending lava flowing away from Grindavik. A second eruption that began on January 14 sent lava toward the town. Defensive walls that had been bolstered after the first eruption stopped some of the flow, but several buildings were consumed by the lava.

Both eruptions lasted only a matter of days. A third eruption began February 8. It petered out within hours, but not before a river of lava engulfed a pipeline, cutting off heat and hot water to thousands of people.

RUV quoted geophysicist Magnús Tumi Guðmundsson as saying that the latest eruption is the most powerful so far. The Met Office said some of the lava was flowing towards the defensive barriers around Grindavik. Iceland, which sits above a volcanic hot spot in the North Atlantic, sees regular eruptions and is highly experienced at dealing with them.