Humberside Police have launched an investigation after a video emerged on social media appearing to show a man spitting on a charity bag before posting it through a letterbox.
The incident is believed to have happened in the village of Kirk Ella, East Yorkshire yesterday (Tuesday 10 November).
Police say they are investigating the "unacceptable" incident to try and prevent further such occurrences.
They have also spoken to the charity - who they will keep in contact with regarding the matter.
Officers want anyone who believes they have experienced the same and has CCTV footage to contact them on our non-emergency number 101 quoting log 112 of today, 11 November.