Three men threatened to spray a man with an unknown substance during a robbery near Dartford. 

Police are appealing for witnesses to the robbery which took place in an alleyway between Main Road and Farningham railway station in South Darenth. 

At around 3.50pm on Friday September 1 the victim was walking down the alley when he was approached by three men. 

One of the suspects reportedly threatened to spray an unknown substance at him and then took his watch. 

The men then fled the scene through the adjacent fields. 

Kent Police said one of the men is described as being in his mid-30s and six foot tall, with brown hair and brown eyes.   

He was wearing grey tracksuit bottoms and a matching grey hooded pullover with pockets. 

The man was carrying a dark blue, plastic sports bottle. 

The other two men are described as being in their mid-20s, one of whom had shoulder length black hair and was wearing dark clothing. 

Anyone with information is asked to call 01474 366149, quoting 46/157174/23.