This story contains graphic images that some readers may find offensive.

On Tuesday, CNN's Anderson Cooper, reporting from Gaza, tweeted a screenshot from a video that showed a group of men dragging a body on their motorcycles through a street. It has been retweeted 2,968 times since it was first posted.

Here is a video that describes what was happening in that photograph -- a group of men dragging a body, who they claimed was an Israeli collaborator and spy, through the streets of Gaza. 

This image below, taken by a Reuters photographer, shows the man  stripped and his legs tied to the back of the motorcycle. The news agency also reported that Palestinian gunmen in Gaza fatally shot six alleged collaborators  who "were caught red-handed," according to an official interviewed by the Hamas Aqsa radio. Here, another photo online shows two of the men on the motorcycles holding a gun.

Palestinian gunmen ride a motorcycle as they drag the body of a man, who was suspected of working for Israel, in Gaza City, on Nov. 20, 2012. (REUTERS/Mohammed Salem)