The Iraqi army stormed to the southern edge of Falluja under US air support on Monday, launching a direct assault to retake the city from the Daesh militants and help protect the nearby capital Baghdad from suicide bombings. As government forces pressed their onslaught, a car bomb as well as suicide bombers driving a car and a motorcycle killed more than 20 people and injured over 50 in three districts of Baghdad, police and medical sources said. Bolstered by Iranian-backed Shiite militia, the Iraqi army launched its operation to recover Falluja on May 23, first by tightening a six-month-old siege around the city 50 km (30 miles) west of Baghdad. Falluja in January 2014 became the first Iraqi city to fall to Daesh, and it subsequently overran wide areas of the north and west of Iraq. On Monday, army units advanced to the southern entrance to Falluja, "steadily advancing" under air cover from the US-led coalition, according to a military statement read out on state TV. A Reuters TV crew on the scene said explosions and gunfire were ripping through Falluja's southern Naimiya district. A Shiite militia coalition known as Popular Mobilization, or Hashid Shaabi, were seeking to consolidate the siege by dislodging militants from Saqlawiya, a village just to the north of Falluja. The offensive is causing alarm among international aid organization over the humanitarian situation in the city, where more than 50,000 civilians remain trapped with limited access to water, food and health care. Falluja is the second-largest Iraqi city still under control of the militants, after Mosul, their de facto capital in the far north that had a pre-war population of about 2 million. Kurdish Peshmerga forces on Sunday launched an attack to oust militants from a handful of villages about 20 km (13 miles) east of Mosul so as to increase the pressure on Islamic State and pave the way for storming the city. Prime Minister Haider Al-Abadi hopes to recapture Mosul later this year to deal a decisive defeat to Daesh. — Reuters