Special Coverage Tonight on "ABC World News" From Alex Marquardt, Martha Raddatz, and Christiane Amanpour ABC News Providing Live Updates Across Digital Platforms ABC News is providing up-to-the minute coverage of the ongoing political crisis in Egypt across all platforms. ABC's Alex Marquardt has been reporting from the epicenter of the protests in Tahrir Square for all broadcasts and platforms throughout the week. ABC News Chief National Correspondent Byron Pitts will join him in Cairo. "World News with Diane Sawyer" will have special coverage of the evolving crisis tonight. Alex Marquardt will have a report from the streets of Cairo while Global Affairs Anchor Christiane Amanpour and Chief Global Affairs Correspondent Martha Raddatz will provide the whole picture on how the events in Egypt, one of the United States" most important allies in the region, impacts Americans. "Nightline" will have an in-depth report in late-night from Alexander Marquardt in Cairo and Christiane Amanpour provide a global perspective on how the events in Egypt impact the rest of the region and the United States. ABCNews.com is providing live updates throughout the day with contributions from the ABC News Foreign Desk led by International Managing Editor Jon Williams along with ABC's Molly Hunter - http://abcn.ws/13lVMXr. Follow the conversation on Twitter with #EgyptABC. ABC's Middle East Correspondent Alex Marquardt was in Cairo as the Egyptian revolution started in 2011 and has crisscrossed the region covering the historic Arab Spring from Tahrir Square to Benghazi to Damascus. Marquardt reported from Cairo last November when Tahrir Square filled with protesters after President Mohamed Morsi granted himself new unchecked powers. WATCH: Egypt on the Brink, Less Than 24 Hours Remain for Morsi to Respond ("World News" 7/2/13) WATCH: Thousands Protesting in Cairo Call for Morsi to Step Down ("World News" 7/1/13) WATCH: Egyptians Rally Against Leader in Cairo Demanding his Resignation ("World News" 6/30/13) WATCH: Turmoil in Egypt Claims Life of American College Student ("ABC World News" 6/29/13) SHOWS: Nightline World News