Tokyo -- A volcano in southwest Japan is showing increasing signs of activity.
Officials say tremors are shaking Mount Ioyama on the border of Kagoshima and Miyazaki Prefectures.
They say that's a sign of magma and gas moving underground. They've also detected swelling on the peak's northwest side.
Workers placed cameras to monitor changes in gas and heat and officials are warning an eruption could take place at any time.
Japan is one of the world's most volcanically active countries.
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