"Please imagine, for just one minute, the loss and heartache that Martin's loving family have endured," a PSNI spokesperson said.

A red Seat Leon car with sports tailpipes and spoiler collided head on with a vehicle while exiting the area where the burglary took place.

Officers are particularly keen to hear from anyone who noticed a dark-coloured Hyundai Tuscan believed to have been in the vicinity

Any person with information is urged to contact Monaghan Garda Station.

The PSNI says enquiries are at an early stage.

The suspects were driving a blue saloon car which was observed heading in the direction of Mullagh a short time later.

'Matthew is 5' 8" in height, of a slim build, with blonde hair and blue eyes'

Margaret Urwin of the Justice for the Forgotten has appealed for anyone with information.