US Strikes on Iran Special Forces: Deadly Blow to Fragile Ties?

Sources on the ground in Iraq exclusively told Sputnik News that the US Air Force carried out strikes against an elite Iranian military unit - a unit that Tehran denies is even in the country. If those reports are true, what effect will this incident have on the future of US-Iranian ties?
The US air strikes just outside of the Iraqi capital Baghdad could have significant repercussions for the US, Iran, and their extremely fragile bilateral relationship.