Jewellery, cash and a mobile phone were stolen from a house in Castleford.
It happened in the early hours of New Year’s Day on Park View.
Det Con Andy Holmes said: “The homeowners have been left distraught by this offence. A large amount of money, some jewellery and a mobile phone were stolen.
“If anyone has been offered jewellery or a mobile phone for sale in suspicious circumstances since New Year’s Day I would also ask them to make contact. Similarly, if someone you know is suddenly in possession of a large amount of cash or the other stolen items then please give us a call.”
Anyone with information should call DC Holmes on 101 or Crimestoppers anonymously on 0800 555111.