Burglars broke into a house through a small open window.
It happened between 3.30pm and 7.30pm on Wednesday.
Burglars broke into the house on Cricket Road in Cowley and searched the house, but it is not known whether anything has been stolen yet.
Thames Valley Police warned residents on its alert page, urging people to download the free home security guide on the force's website.
Anybody with information should call 101 quoting the reference number 43190379034.
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