Landlord Insurance Cover on Water Leaks in Blocks Of Flats

What happens if a landlord has a problem of a major water leak within a rental property? Imagine the buy-to-let property in question was a top floor flat. The result was that damage had not only been caused to the carpet in their flat but also to the carpet of the tenanted flat below. In addition to the carpet, the ceiling in the flat below had also been damaged resulting in the plaster bubbling