It wasnt just the Mosque...I believe they were erasing all Arabic words from even houses as well....anything which was related to Islam and Holy Prophet SAW.....i actually call this a Blasphemy.
When I used to visit my Muslim friends in narrow streets. I was surprised to see pices of papers stuck in the street walls in the space between bricks of the walls. Countless pieces of papers. One day out of my curiosity, I fetched out one such paper to read what was written on it. It was written in Urdu which I could not read. I placed the paper where it was. Later I asked my friend about it. He told me that since the writing is in urdu, so our elders fear that there may be name of the holy prophet or ALLAH in it and it may come under feet if left scattered on the ground.therefore whenever they see any such paper lying on ground, they immidiately fix it on the wall which is convinient way to ensure that papers doesnt come under anyone's feet.