Iraqi in crisis as Isis targets Baghdad - in pictures

Isis fighters stand guard at a seized checkpoint in the northern Iraqi city of Mosul. Photograph: Reuters

An Isis militant posing with the Islamists flag after they allegedly seized an Iraqi army checkpoint in the northern province of Salahuddin. Jihadists are pushing toward Baghdad after capturing a town just hours to the north. Photograph: AFP/Getty Images

This video still shows a militant standing in front of a burning Iraqi Army Humvee in Tikrit, Iraq. The al-Qaida-inspired group that led the charge in capturing two key Sunni-dominated cities in Iraq this week has vowed to march on to Baghdad. Photograph: AP

Militants on Al-Sharqat base north of Saddam Hussein's hometown Tikrit, which was taken by Isis fighters, as soldiers and security forces abandoned their posts and yielded ground once controlled by US forces. Photograph: AP

Children at a newly made refugee camp near Khazar checkpoint. As many as 500,000 people have been forced to flee Mosul after hundreds of Islamist militants took control. Photograph: Jawdat/Barcroft Media

Kalak checkpoint on Mosul-Irbil. Thousands of people who fled wait in the blistering heat, hoping to enter the safety of the nearby Kurdish region and furious at Baghdad's failure to help them. Photograph: Fazel Hawramy for the Guardian

Looting at K1 Iraqi army base, west of Kirkuk. Photograph: Fazel Hawramy for the Guardian

Men chant slogans against Isis outside the main army recruiting centre to volunteer for military service in Baghdad after authorities urged Iraqis to help battle insurgents. Photograph: Karim Kadim/AP

Volunteers who have joined the Iraqi Army to fight against the predominantly Sunni militants travel in an army truck in Baghdad. Photograph: Ahmed Saad/REUTERS

Children walk outside temporary tents set up to shelter those fleeing violence in Iraq's northern Nineveh province. Photograph: Safin Hamed/AFP/Getty Images

Iraqi children sleep in a tent at a temporary camp in Aski Kalak. Photograph: Safin Hamed/AFP/Getty Images

Kurdistan's Peshmerga forces transfer tanks on the borders of Kirkuk city, taking complete control of the disputed city after the Iraqi army withdrew. Photograph: Khalil Al-A'Nei/EPA