Police fired tear gas into the compound to disperse mourners and supporters, some of whom were taunting officers.

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The element to be purified is first incorporated into a chemical that can be turned into a gas. (In this case, the exact compound is still proprietary information.) Then an infra-red laser is shone through the gas.

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Police say the boy told the leaders he had forwarded the message without reading it to others in the middle-class compound for employees of the local gas company where he lived.

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