IRBIL, Iraq — Under the Iraqi town of Sinjar, Islamic State in Iraq and Syria(ISIS) group militants built a network of tunnels, complete with sleeping quarters, wired with electricity and fortified with sandbags. There, they had boxes of U.S.-made ammunition, medicines and copies of the Quran stashed on shelves. The Associated Press obtained extensive video footage of the tunnels, which were uncovered by Kurdish forces that took the city in northwestern Iraq earlier this month after more than a year of ISIS rule. “We found between 30 and 40 tunnels inside Sinjar,” said Shamo Eado, a commander from Sinjar from the Iraqi Kurdish fighters known as peshmerga.