A number of sheds have been broken into in Faygate.
Police say those targeted are in the Wimlands Road area.
Two trial bikes have been stolen during the raids which officers believe took place some time between 5.45pm and 8.30pm on Monday May 20.
PCSO Emma Atvarnieks, of Horsham police, said: “The offender/s were able to gain entry by forcing the padlocks. Two trial bikes were stolen, it is not believed that anything else was taken.”
Police are appealing for any witnesses.
Anyone with information can contact Sussex Police on 101 quoting serial number 1444 of 20/05/13.