Indian officials say one person has died and at least 20 people were injured in a series of blasts Sunday morning at the Kalamassery Convention Center in Kerala, where a Jehovah’s Witness meeting was being held.

The Times of India reports that 10 people are in a burn unit and two of them are on ventilators.

One official said an IED device had been used in the explosions, according to the Times.

Authorities say a national security team has been dispatched to the site to conduct a probe. 

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