A jogger was stabbed in the chest with a stanley knife during an attempted robbery.
The 35-year-old victim was jogging along the towpath of Macclesfield Canal with his dog when an offender grabbed hold of the dog lead.
The suspect then threatened the man with a Stanley knife and demanded his iPhone 6.
The victim then realised there was another man present.
After refusing to hand over his phone the trio began to struggle.
During the skirmish the victim was stabbed in the chest.
He continued to fight off the offenders who fled the scene on their mountain bikes empty handed.
The men were last seen cycling off towards the Puss in Boots pub.
The victim went to Macclesfield Hospital where he was treated for injuries to his chest and arm.
The incident happened near bridge 36, just north of Barracks Lane, at 10pm on May 4.
Police have now released descriptions of both offenders and an efit of one of the men they would like to speak to in connection with the attempted robbery.
The main offender is described as white, clean shaven, 5ft 10ins tall, aged 18 to 19 and of slim build with a long nose.
He was wearing a dark beanie-style hat, a dark coloured round necked sweatshirt with long-sleeves, slim fitting dark blue jeans and black shoes.
He also wore thin black work-like gloves that were either latex or thin leather.
Police say he may have had a Wigan or Bolton accent.
The second man is described as white, 5ft 10ins tall, aged 18 to 19 years old with short, shaved dark hair.
He was wearing a dark sweatshirt and a black polo type shirt with the collar up. He was also wearing dark black jeans or bottoms, and dark-coloured shoes.
Anyone with information should contact DC Dale Hawtin on 101 quoting incident number 904 of 4 May 2015.
Alternatively information can be given anonymously by calling Crimestoppers on 0800 555 111.