The powerful typhoon that hit the Tokyo metropolitan area earlier this month appears to have damaged at least 20,000 houses in Chiba Prefecture, local government officials said Tuesday.

The tally was far larger than the roughly 4,000 that the Chiba Prefectural Government officially announced earlier Tuesday.

A Chiba official said the number of houses damaged by Typhoon Faxai may increase because local authorities have yet to find out details about affected areas as they have been busy dealing with power cuts and evacuated people.