Yep. Not impossible but seems wildly impractical and would probably take a long time to incapacitate someone with it, unless it’s frozen or something.
I think the source may have been describing the relative shape and size and in true Mail fashion they’ve run with it as a “omg drinks can” headline because they’ve little else to add to their earlier content.
“A police source said officers believed the red item was an ‘object like a drinks can’.”
The word ‘like’ is doing a lot of heavy lifting.
I would not trust the Daily Mail as the reporting is so badly worded at times. The one thing is it is a metal object. As we can rule out knives the best we can say is it is rounded and heavy enough to kill a person. I just cannot see a can of cola filled with rocks being used