[Ed. – This would presumably be the Iran-backed Hashd al-Shaabi, or popular force “militias,” which have a presence in the north and were part of the surge that retook Mosul from ISIS. It is far less likely that remnants of ISIS would draw attention to themselves with a weak, limited attack of this kind on U.S. forces. That has not been ISIS’s M.O.; it has been that of the Hashd. The image of punks using slingshots in the AP report is about as wienerly as it gets. Katyusha rockets kill people.]
A barrage of Katyusha rockets targeted an Iraqi air base that houses American troops south of the city of Mosul on Friday, two security officials said. There was no immediate word of casualties from the attack.
The rocket fire appears to have originated in Mosul and struck the Iraqi army base in Qayyara, about 60 kilometers (38 miles) south of Mosul, where a U.S.-led coalition is helping Iraqi forces battle remnants of the Islamic State group. …
Some hard-line Iraqi militias loyal to Iran have recently threatened to carry out attacks against Americans in the country. The U.S. maintains about 5,000 troops in Iraq.