THIEVES are simply walking into homes to commit half the burglaries now happening in Huddersfield.
Police are amazed how many victims continue to leave their doors unlocked, making life easy for opportunist thieves.
The intruders mainly sneak in, grab handbags, mobile phones and cash from kitchens and then flee.
But they leave an immense amount of turmoil for the victims who have to stop all their cheque books and credit cards.
And sometimes the thieves take the keys, which mean all the house locks need to be changed at considerable expense.
Thieves have also been known to take car keys and drive away in the victims' vehicles.
Sgt Tim O'Sullivan, of Huddersfield police, said: "We make repeated pleas to people to make sure their doors and windows are locked at all times - even when they are at home.
"These burglars take just seconds to strike and sometimes victims don't even know the thieves have been in their homes until they can't find their purse, wallet or car keys.
"Offences like this cause a tremendous amounts of hassle for people on top of the trauma of being a victim of crime."
He added: "Weekends can be the worst times when people seem to let their guard down even more.
"Perhaps teenagers leave doors unlocked when they return home after a night out clubbing or when they go out on early morning paper rounds.
"We have had crimes committed when people have gone out to take their dogs for a walk and left the doors unlocked."
In one of the latest crimes, a teenage thief sneaked into a house on Maplin Avenue, Salendine Nook, at 6pm on Monday.
He stole a brown leather bag containing a purse and keys along with a brown shopping bag and then fled.
He is aged 18 or 19, about 4ft 5ins tall and wore a blue hooded fleece.
He is thought to have been with two accomplices who were waiting further down the street.