AP - 12 minutes ago BAGHDAD, Iraq - The killing of Abu Musab al-Zarqawi raised hopes that Iraq's slide toward civil war or sectarian disintegration could be arrested, but there are signs that Shiite-Sunni antagonism may now be too deeply rooted. Al-Zarqawi, a Jordanian-born Sunni Muslim, played a key role in stoking Shiite-Sunni tensions the past three years, ordering hundreds of bloody attacks against Iraqi Shiites and issuing vitriolic tirades seeking to deepen a religious schism that dates back 1,400 years.