Facebook has turned on its Safety Check feature after the London tower block fire

Facebook has activated its Safety Check feature following after a huge blaze ripped through a 24-story residential tower block in west London.

The fire at Grenfell Tower started shortly before 1am on Wednesday and London Mayor Sadiq Khan has declared it a “major incident.”

London Fire Commissioner Dany Cotton told reporters on Wednesday morning that there have been “number of fatalities,” but said many had been rescued. She added: “In my 29 years as a firefighter, I have never, ever seen anything on this scale.”

Safety Check asks people in the area of the incident if they are safe, and publicly marks them as such if they say they are. Users can see which of their friends have marked themselves safe, and asks those in the area if they are.

Facebook safety check London TowerFacebookFacebook Safety Check for Grenfell Tower.

Facebook has activated Safety Check more than 300 times in the last year, according to CNET. It was also turned on during the Manchester terror attack and the Westminster terror attack, as well as after Hurricane Matthew ripped through the Caribbean, killing hundreds of people on the island of Haiti. It was first deployed in 2014.

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