Dyfed-Powys Police close investigations without identifying a suspect in six out of 10 household burglaries and a third of reported vehicle thefts, new analysis shows.

They also ended almost a quarter of shoplifting cases with the same outcome

Across the three offences, around 1,000 investigations in Dyfed-Powys were shut with no suspected culprit in the frame, the Press Association found.

The revelations prompted warnings that victims could be put off reporting offences, while criminals are given a "green light to reoffend".

Police chiefs say increased demand and reduced officer numbers mean they have to prioritise cases where there is a realistic chance of prosecution.

The figures were extracted from Home Office crime outcomes data, and cover the 12 months to March 2018.

They show that out of the 859 household burglary cases opened over that period by Dyfed-Powys Police, 62% were categorised as "investigation complete - no suspect identified".

This is used when a reported crime has been investigated "as far as reasonably possible" and the case is closed pending further investigative opportunities.

Of the total burglary cases, Dyfed-Powys Police brought 35 people to court.

Labour MP Yvette Cooper, who chairs the Commons Home Affairs committee, said: "Too many investigations are closing without suspects being identified and we are hearing increasing reports of the police being too overstretched to investigate.

"Police forces are under immense pressure with rising serious and violent crime and changing patterns of crime alongside cuts in the numbers of officers and PCSOs.

"These figures suggest that investigations into volume crimes are now being hit. Failing to identify suspects gives criminals a green light to reoffend."

The country's larger police forces tended to have higher percentages of cases closed without a suspect being identified.

Alex Mayes, of charity Victim Support, said: "News like this could undermine confidence in the criminal justice system and prevent people reporting in the future."

Of the 218 vehicle thefts recorded in Dyfed-Powys, 34% ended up with no suspect being identified, while in the 1,846 shoplifting cases, 425 of them were closed with the same outcome.

The police charged 24 suspects with car theft, and 441 for shoplifting.

RAC Insurance spokesman Simon Williams said motorists will be "shocked" by the findings.

"This is a sign that thieves have found ways around car security systems and have ways of selling vehicles on with little or no fear of being caught," he said.

Deputy Chief Constable Amanda Blakeman, National Police Chiefs' Council lead for acquisitive crime, said increased demand and fewer officer numbers have led to forces prioritising cases with a realistic prospect of prosecution.

She added: "Police investigate all cases of theft, burglary and shoplifting. Particularly for these types of offences, police focus on targeting prolific offenders, organised crime networks, and ensuring prevention measures by homeowners and businesses are in place."

A Home Office spokesman said: "We expect the police to take all reports of crime seriously, to investigate and to bring the offenders to court so that they can receive appropriate punishment.

"However we recognise that crime is changing and police demand is becoming increasingly complex. That is why we have provided a strong and comprehensive £13 billion funding settlement to ensure the police have the resources they need to carry out their vital work."

Head of CID, Detective Chief Superintendent Shane Williams, said: “Dyfed-Powys Police provides a professional response to every investigation, prioritising those where there is the most threat of harm towards the most vulnerable people in our communities.

“We look for viable lines of enquiries in all investigations and we have review processes in place to ensure we do not miss opportunities in the investigation.

“We accept that the burglary statistics are relatively low however when looking at aggravated burglary, which involves threat to an individual at the time of the offence, we have identified all suspects within the given period and also identified 86 per cent of offenders in all robbery offences.

“It is also important to note the effect of the reclassification of this particular crime category, which from April 2017 meant dwelling burglaries also came to include shed, garage and out-building burglaries, as well as the home. This change does factor for some of the increase in this category.

“As a force, we are fortunate that the volume of offending is relatively low in comparison to the rest of the UK.”