Iraqi and Shia militia forces have been taking back ground from Islamic State, pushing the jihadist fighters out of much of the town of Tikrit.

But in a sign of Tehran’s growing military presence in the Iraq, Iranian weapons were a nearly ubiquitous sight in images and videos coming out of the offensive to take the mostly Sunni city.

Ever since Islamic State shocked the region with its capture of Mosul last summer, Iran has opened up its arsenals and flooded clients, proxies and friends in Iraq with arms and vehicles. […]