Cairo ( CNN ) -- Supporters and opponents of deposed Egyptian president Mohamed Morsy clashed near Cairo 's Tahrir Square on Monday , leaving one person dead and 26 others injured , an emergency official said . Opinion : Why the Muslim Brotherhood ca n't back down . In one incident , a gunman opened fire near the square with an automatic weapon , and at least two people dropped to the ground , a witness told CNN . It was n't clear which side the gunman belonged to . At least some of the clashes occurred when Morsy supporters who had been marching toward the U.S. Embassy shifted toward the square , where some Morsy opponents were , witnesses said . Some Morsy supporters had gathered outside the U.S. Embassy on Monday but were dispersed by Egyptian security forces , who fired tear gas at them , state-run EGYNews reported . The embassy is about 1 kilometer from Tahrir Square . The clashes come nearly three weeks after Morsy , backed by the Muslim Brotherhood , was forced out of office by the Egyptian military.. Egypt has been on edge ever since , with dozens reported killed and thousands injured in protests . CNN 's Mitra Mobasherat contributed to this report .
Supporters and opponents of him clashed near Cairo 's Tahrir Square . One was dead and 26 others injured , an emergency official said . The clashes occurred nearly three weeks after Morsy was voted out of office .