Michael Bay is currently filming Transformers 4 in Chicago where a lucky fan was on hand to take some video of the set.
Lining the streets we see a plethora of anti-Transformers propaganda with "Remember Chicago" a reference to the previous movie, Dark of the Moon.
In addition, "report alien activity" is seen which tells the humans to call a number and report on anything suspicious.
Images of the Dark of the Moon Optimus Prime, Megatron and Bumblebee make up the anti-Transformers propaganda posters.
Transformers 4 has a Summer 2014 release directed by Michael Bay and starring Mark Wahlberg, Jack Reynor, Nicola Peltz, Sophia Myles, Li Bingbing, T.J. Miller and Kelsey Grammar.