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Lightning strike fire reaction

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Air raid siren woke Greenwich residents

An air raid siren sounded over Greenwich today as more than 60 firefighters battled a blaze at a chemical processing plant.

The alarm was sounded as a precaution after the fire at the factory threatened to affect a unit containing hazardous chemicals.

@4tea2 sent us this video of the siren:

The incident, which saw smoke fill the air around the unit on Peterboat Close, has now been brought under control.

The warehouse on fire contained "swimming pool chemicals" but the siren was sounded to alert the public to "more dangerous chemicals" in a nearby building.

This building, one of only a few in London required to have a siren for safety reasons, was not affected by the fire but London Tonight has been told the alarm was sounded as a precaution.

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Fire brigade advise people in Greenwich to shut windows

Around seventy firefighters are tackling a blaze at a factory in Greenwich

Due to the heavy smoke and sound of sirens, London Fire Brigade says it's received a number of calls from people across south east London.

The factory contains chemicals used to clean swimming pools and although it's not thought that the smoke is harmful in any way, fire chiefs are advising people in the area to keep their doors and windows closed as a precaution.

Deputy Assistant Commissioner Bernie Higgins is the Incident Commander: