The (Egyptian) natives are restless, complaining about the army holding too much power in the ongoing transfer of power, so they've (re)taken to the streets, including the famous Tahrir Square, to protest. It is, as the above fellow notes, all very deja vu.
On a side note, I went online to research the Arabic words you see above. Thus the sign really does say Tahrir Square (or, to be more precise, Mīdān at-Taḥrīr) and the riot shield really does say "police", or rather a phrase I found under the word "police" on the riot shields in a photo of Egyptian policemen.
Drawn using: No. 2 pencil (sketch) Black 0.4 mm pilot pen Black 0.5 mm pilot pen Serif PhotoPlus 6.0