Unlocked bikes are targets of thieves.
Three thefts happened overnight between Monday, March 10, and Tuesday March 11, with all bikes taken after being left insecure.
A boy's blue stunt bike, with stunt pegs, and a girl's black and pink BMX were stolen from front gardens at two separate addresses on Ashgill, in Albany.
A black and green Carrera Vulcan mountain bike was also taken by thieves from the back garden of an address on Cherwell, in Sulgrave.
These incidents follow a spate of thefts in recent weeks of bikes left insecure or unattended, or secured with a small chain lock.
People are once again being asked to make sure their bike is locked or stored away securely when not in use to avoid giving thieves an easy ride.
Washington Neighbourhood Policing Team can mark bikes.
They can be contacted via 101 ext 69191.