HARBIN - One person was killed and three others injured in an explosion in a residential building in Harbin, capital of Northeast China's Heilongjiang province Thursday morning, local authorities said.

The blast, suspected to have been caused by an explosion of a gas tank, occurred at around 7 am Thursday in the building in Harbin's Xiangfang district, according to the district's government.

The injuries of the three persons are not life-threatening.

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Further investigation into the cause of the explosion is underway.