Police are investigating reports that a man approached people with a knife in Gainsborough.
According to social media, a man and a woman were walking down Scouts Hill at around 11.30pm Sunday evening when they were approached by a man on a silver bike.
The man allegedly attempted to attack them with a knife before pursuing them on his bike whilst they attempted to get away.
The man is described as 6ft tall, with very short hair and wearing a grey t-shirt, blue jeans and a bag at the time of the incident.
Police are asking anyone who may have seen something to call them on non-emergency number 101 quoting incident 579 of 5 August.