Ahead of Friday prayers, an Al Jazeera correspondent tours the perimeter of what protesters have dubbed "Change Square" in Yemen's capital.<br /><br />Civilians have set up checkpoints next to defensive rock piles to prevent weapons from entering the square, but professional army soldiers have joined their ranks as well.<br /><br />Opposition groups have dismissed President Ali Abdullah Saleh's offer to step down by year's end - after 33 years in power - after dozens of protesters were killed one week ago in Change Square.
