Transcript for 'This Week': Crisis in Iraq
Good morning. I'm Martha Raddatz in Baghdad where the battle for control of Iraq has take an dire turn. The jihadist group Isis gaining new ground, capturing four key towns. Near the Syrian border. Threatening this country and the entire region. And the U.S. Homeland with its growing strength. We have team coverage of the latest developments including breaking details on the U.S. Special forces preparing to advise the Iraqi army. We begin in Baghdad, where shiite militias took to the streets this weekend in a show of force. Members of the Madi army who once led the fight against Americans in Baghdad's city, now vowing to stand up against Isis. The jihadist fighters threatening Baghdad's borders. Isis gained critical new ground this weekend, after wiping out an entire Iraqi brigade. Isi sirks now controls Al qa'im, on the Syrian border, giving the terror group the ability to move weapons into Iraq from Syria. They surrounded Iraq's largest oil refinery. A portion seen here in satellite images burning. If it's overtaken, the militants would get a significant control over the gas and power supply. And Iraq's security forces have little ability to regain control of all that has been lost. They have no offensive capability. And no real air power. And now, a growing fear, more westerners joining the ranks of foreign fighters descending on the country. We will go in a few days and fight them. Reporter: This flashy new propaganda video showing british and Australian recruits. In sponge to the terror group's March, young Iraqi men are scr scrambling through Baghdad's marketplaces to find body armor and uniforms left behind by the American mill stair. Vowing to defend their city. I have to fight. For my family, for my country. For everything. Reporter: If they can't find uniforms, they go any way. We saw thousands and thousands of young shiia men lining up to serve without weapons and protection. They're anywhere from 12 years old and up. Some have already lost family members to the Jihadi fighters. Behind this battle, everyday citizens who have already been through so much. This family moved to Syria during the worst parts of war in Iraq. With war raging in Syria, they're back. The 11-year-old and the other children have the same nightmares. What do you worry about most? The explosion, she said. The explosions. A reality that these children have now lived with most of their lives. And when we left that family, that night, just outside that restaurant were truckloads of armed shiite militias patrolling the streets. Taking the law into their own hands.
This transcript has been automatically generated and may not be 100% accurate.