Fighters of the Islamic State of Iraq and the Levant (ISIL) celebrate on vehicles taken from Iraqi security forces, at a street in city of Mosul, June 12, 2014. Since Tuesday, black clad ISIL fighters have seized Iraq's second biggest city Mosul and Tikrit, home town of former dictator Saddam Hussein, as well as other towns and cities north of Baghdad. They continued their lightning advance on Thursday, moving into towns just an hour's drive from the capital. Picture taken June 12, 2014. REUTERS/Stringer

Photos released by the Islamic State of Iraq and Syria (ISIS) of “war spoils” the radical Islamic group captured during its recent campaign near Mosul in Iraq have been making the rounds on social media.

Pictures on Twitter show ISIS militants with U.S.-made Humvees and heavy weapons claimed to be commandeered when Iraqi military units fled battle. In only five days, ISIS took control of Iraq’s second largest city. They routed Iraqi military units and some reports claim Iraqi soldiers tried to escape the city by dressing up as civilians.

Around 500,000 people fled the city, with 40,000 others fleeing Tikrit, a city about 100 miles north of Baghdad, when ISIS moved in. Iraq’s main Shiite cleric, Grand Ayatollah Ali al-Sistani called on Shiites across Iraq to volunteer to defend against ISIS and recruiting stations have been packed with volunteers.

This is what the aftermath of the ISIS advance looks like:

They come from what appears to be an official ISIS outlet that also released photos of ISIS militants summarily executing captured Shiite soldiers from the Iraqi military. The full album can be found here via Al Aan TV’s Jenan Moussa. [WARNING: GRAPHIC PHOTOS DEPICTING DEATH]

Iraqi army Shiite soldiers are seen being trucked to open areas where mass graves have been dug, then laid down and shot at point blank range. Jihad expert Aaron Zelin at the Washington Institute says 3,000 captured Sunni soldiers were pardoned and 1,700 Shiite soldiers were executed.

ISIS also reportedly made off with up to $425 million from Mosul's banks.