Humberside Police are investigating reports that two men attempted to grab a 16-year-old girl against her will in Grimsby.
The incident happened at around 3.45pm on Saturday, January 6, on Dudley Street approaching Cartergate.
Members of the public intervened and prevented the men from harming the girl and the incident came to an end.
A police spokesperson said: “We are keen to speak to witnesses who assisted the girl or who saw the incident to help us with our enquiries as we try to establish the intentions of the men and the circumstances of the incident.
“A number of vehicles were said to have stopped to assist and we are particularly keen to hear from the occupants of those vehicles as they may have important information.”
The men are described as white and in their 30s.
One was said to be 5ft 10/11ins in height, with black/brown longish hair and wearing a black jumper, black jeans and black shoes.
The second man is described as wearing a black coat, blue jeans and beanie hat.
Anyone with information should call police on 101, quoting log 291 of January 6.