POLICE have raised concerns following a spate of burglaries by thieves posing as good neighbours.

In recent weeks, Cleveland Police have dealt with about five such burglaries in the Marton and Acklam areas of Middlesbrough. Those responsible have knocked on doors saying they have just chased someone into the householder's garden or have seen someone breaking into their shed, and while the householder has gone to investigate, the thieves have sneaked in and stolen anything in sight.

Most of the homes targeted have been in relatively affluent areas, with many of the victims pensioners. Police arrested two men in Marton last week, following a complaint from a resident, but they had insufficient evidence to charge them.

Sergeant Ian Hudson, of Coulby Newham police, said the thieves' methods were particularly devious.

"In a walk-in offence, burglars don't have to carry tools with them so they look like anyone else in the street," he said. "It also means that when people report them, there isn't enough evidence to charge them.

"They are quite clever in that sense."

Sgt Hudson said the items stolen have been small, such as women's handbags left near doors and windows. "In the majority of the recent thefts, they have been looking for small items they can grab easily, like handbags," he said.

"They tend to take the most valuable items and ditch the rest."

He said even if not much is taken, the victim is often left extremely distressed.

"People trust someone who comes to their door and alerts them to a burglary, or says they have kicked a ball into their garden, which is also quite common.

"It's quite a devious and nasty thing to do, and I would warn people that even the most innocent- looking people can commit crime."

Sgt Hudson urged residents to keep doors locked and valuables away from windows.

One thief who has deceived people is described as white, in his early 20s, 5ft 10in tall, of medium to stocky build, and with short brown hair brushed forward.