Israel's 'roof knocking' in Gaza

Al Jazeera investigates Israeli practice of firing warning shots at homes before blowing them up.
Amid growing criticism of Israel's targeted air strikes in Gaza, Al Jazeera investigates practice whereby Israel fires warning shots at homes before blowing them up with missiles.

http://www.aljazeera.com/video/middleeast/2012/12/2012124105548532777.html