NEW : Apparent military effort to reopen Tahrir Square is underway . The crowd roared back a chant that has been repeated for days across the open expanses of Tahrir Square : `` Leave , leave , leave . NEW : When Mubarak leaves , they will leave , the protesters say . The Tahrir Square protesters formed a human chain to prevent soldiers from entering . Scuffles broke out when soldiers knocked down some protesters , a reporter said .
NEW : Apparent military effort to reopen Tahrir Square is underway . NEW : When Mubarak leaves , they will leave , the protesters say . The Tahrir Square protesters formed a human chain to prevent soldiers from entering . Scuffles broke out when soldiers knocked down some protesters , a reporter said .