Lava ejects from Hawaii's Halemaumau Crater

HILO, HI Officials with the U.S. Geological Survey's Hawaiian Volcano Observatory say some of the particles -- the largest of which measure four inches across -- have landed on the rim of the crater.

Scientists say the gas from the new vent at Halemaumau is thick with ash, making the plume from the 100-foot-wide vent appear brown.

Officials are continuing to monitor the activity, and say aviation agencies have been warned that the ash may threaten aircraft in the area.

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