CAIRO (AP) — A protest by at least 100,000 Egyptians outside the presidential palace in Cairo turned violent on Tuesday as tensions grew over Islamist President Mohammed Morsi's seizure of nearly unrestricted powers and a draft constitution hurriedly adopted by his allies.

Crowds around the capital and in the coastal city of Alexandria were still swelling several hours after nightfall. The large turnout signaled sustained momentum for the opposition, which brought out at least 200,000 protesters to Cairo's Tahrir Square a week ago and a comparable number on Friday. They are demanding the Morsi rescind decrees that placed him above judicial oversight.

In a brief outburst, police fired tear gas to stop protesters approaching the palace in the capital's Heliopolis district. Morsi was in the palace conducting business as usual while the protesters gathered outside. But he left for home through a back door when the crowds "grew bigger," according to a presidential official who spoke on condition of anonymity because he was not authorized to speak to the media.