The vehicles - an Audi A5 and an Audi A6 - were discovered stolen on Saturday morning from the Carrick Strand area of the town. They have not been recovered.A third car, a Ford Mondeo, was broken into and ransacked in the same area.In the nearby townland of Clady, an attempt was made to steal a Citroen Xsara car from Dunowen Park while a handbag was stolen from a Ford Fiesta on Sunday night/Monday morning.Criminals also entered a house and stole two laptop computers and other valuable items.Chief Inspector Andy Lemon, the Area Commander, said that police believed the two sets of incidents were linked to a gang of travelling criminals from Dublin.He said that police were seeking information about a silver Audi car and two BMWs seen in the general area over the weekend."The silver Audi had a Dublin registration, 05 D 87687, and was stolen there on April 23rd. We would like to learn more about its movements and the occupants."We are also keen to know more about two BMW cars that were seen in the Orchard Road area between Sion Mills and Clady on Friday evening."One of the BMWs had a southern registration, while the second was not displaying any registration plates."Information can be given to the CID in Strabane by calling the 101 non-emergency number, or contacting Crimestoppers anonymously on 0800 555 111.Chief Inspector Lemon called on all residents and car owners to protect their property."Always lock vehicles, even when they are outside your home, and make sure the doors and windows of your house are closed and locked at night."Most modern cars are difficult to steal without the keys, and it is the keys thieves are looking for. They will seek to get into a house to steal the keys, so keep them out of view and in a safe place," he said.