House roof has suspected lightning strike on Norman Crescent in Pinner. Image: Londonfire / Google Maps

Firefighters have been called to a house fire after a suspected lightning strike on Norman Crescent in Pinner this afternoon.

The roof of the semi-detached house was well alight.

#Pinner house roof destroyed by mother nature as lightning strike causes blaze london-fire.gov.uk/LatestIncident… http://t.co/BIrkmbJ1Vl

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London Fire Brigade (@LondonFire) May 20, 2015

Four fire engines and 21 firefighters and officers from Harrow and Ruislip have been attending the incident.

Half of the first floor was damaged and the roof was destroyed by the blaze.

Damage house in Pinner- fire said to have been started by lightning. Image@LondonFire

The Brigade was called at 1:36pm and the fire was under control by eleven minutes past three.

The cause of the fire is not known at this stage, but is believed to be a lightning strike.

First pic of house fire caused by lightning strike on Norman Crescent #Pinner. Whole of roof is alight © @chafferty http://t.co/Q98s3zqYYu

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London Fire Brigade (@LondonFire) May 19, 2015

Lightning strike fire on Norman Crescent in #Pinner now under control © @Kageyworld london-fire.gov.uk/LatestIncident… http://t.co/wi8JN2Qwfi

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London Fire Brigade (@LondonFire) May 19, 2015

@LondonFire @vicki_manser crews working hard to contain the fire in Pinner http://t.co/793wyZcLnE

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Gary Guzzelled (@GaryGuzzelled) May 19, 2015