The Environment Agency has apologised to Oxfordshire residents for failing to issue a flood warning until six hours after they were under water.
Among the flooded were seven properties in the Wendlebury area and another three in Steventon near Abingdon. It happened when a third of a month's rainfall (33mm) fell in one night last week.
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Kate Haskell has the weather for the east of the region
Kate Haskell has the weather for the west of the region
Police said they are concerned for the welfare of 13-year-old Serena Alexander-Benson.