A crackdown on suspected criminals travelling in to a Hertfordshire city is under way at a railway station.
Police have started high-visibility patrols at St Albans railway station in a bid to tackle criminals from Luton and London, a spokesman said.
Hertfordshire and British Transport Police are using drugs dogs in the operation, prompted by increases in pick-pocketing and street robberies.
Patrols are also targeting the theft of bicycles and shop-lifters.
Police are keen to point out that overall crime in the city has reduced by over 9%.
A similar two-week operation was carried out in February last year.