Generate an appropriate single-sentence summary for the given text such that it includes the main topic of the text.
Q: Seventy-nine people are now feared dead after the London fire last week with concerns raised about the cladding installed on the building. Carl Sargeant told AMs on Tuesday that Welsh registered social landlords own 36 blocks of seven or more storeys. He said seven blocks had been "retro-fitted" with fire sprinklers. A new "expert group" would advise on the lessons for Wales from the fire, Mr Sargeant said. Updating AMs on the Welsh Government's response to the fire, he said his "deepest sympathies" were with all those affected. Mr Sargeant said: "It appears the direct cause may have been the use of combustible cladding. "We have therefore completed a first round of urgent discussion with all registered social landlords in Wales. "Between them they own 36 blocks of flats of seven or more storeys. "Social landlords have told us none appear to be fitted with the type of cladding used at Grenfell Tower." The new expert group will include representatives from the social housing and fire sectors and will be chaired by the Welsh Government's chief fire and rescue adviser Des Tidbury. Grenfell Tower's exterior cladding, added in 2015, had a polyethylene - or plastic - core instead of an even more fireproof alternative. The cladding was used on other buildings hit by fires around the world.
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Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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No high-rise blocks used for social housing in Wales appear to have the cladding used at Grenfell Tower, the communities secretary has said.