Jewellery was stolen in burglaries at three properties in Bicester.
Between around 2pm and 9.45pm on Tuesday, September 29, offenders forced entry to the rear of a property on Lapwing Close.
Once inside, they stole items of jewellery including a blue sapphire ring, a chain with a pearl, a Pandora bracelet, a Fossil watch and a Links of London watch, iPhones, a Acer laptop and an iPad.
A black BMW was seen around the area at about 7.40pm.
On the same day, between around 3pm and 5pm, burglars entered a home in Newton Morrell Farm, through a window.
Items of jewellery were stolen including a gold necklace, an engagement ring, a Pandora bracelet, a DKNY watch and a Lacoste watch and perfume.
And between around 1pm and 5.45pm on Wednesday, September 30, burglars smashed a kitchen window at a property in Corncrake Way.
Once inside they stole a watch, a Temperly handbag, an iPad and a platinum wedding band.
Investigating officer, PC Nathan Davis from Banbury police station, said: “We are appealing to anyone who may have heard or seen suspicious behaviour in the areas at this time please get in contact via the Thames Valley Police 24-hour enquiry line 101.
“If you saw any suspicious vehicles or the black BMW please let us know,
“It is also a reminder to keep all doors and windows secured even if you are still in the property.”
Anyone not wanting to speak directly to police can Crime Stoppers anonymously on 0800 555 111.