BBC - "US struggles to quell Iraq revolt."
US-led coalition forces have clashed with insurgents across Iraq in escalating violence.
"US marines have seized part of the flashpoint town of Falluja, a centre of Sunni Muslim resistance, after more than a day of fighting.
"There has also been further violence in Shia areas, as coalition forces battle militias loyal to radical cleric Moqtada Sadr for a third day."
"Amid the increasing insecurity, Iran has warned its nationals not to travel to neighbouring Iraq, even for brief pilgrimages to Shia Muslim holy sites, Iranian state media reported."