This looks like it is in regards to the death of the soldier on October 1st, about 2 weeks ago. Also, it's the kind of bombs the Iranians use and build. Not sure where this will lead though.
Iranian-linked bomb kills American solider in Iraq | FDD's Long War Journal
Alexandra Gutowski
A lethal bomb generally associated with Iran and its proxies has reemerged in Iraq after a six year hiatus, killing an American soldier. The Washington Post first reported that an explosively formed penetrator (EFP) was used in a roadside attack that occurred in Salah ad-Din province on Oct. 1.
The commander of Operation Inherent Resolve Land Component confirmed during his briefing today that a steel EFP struck a US vehicle at a dip in the road along Route Tampa. The bombing occurred as the Islamic State’s territorial control in Iraq wanes.
An explosively formed penetrator (EFP) was the signature of the Mahdi Army and Special Groups, Iranian militias that targeted US and allied forces in Iraq. Composed of a milled concave plate typically formed of copper, EFPs are extremely lethal, even against thick armor.
Continued at: https://www.longwarjournal.org/archives/2017/10/efp.php
