Not really new IIRC the Red Brigades or the Bader Meinhof gang used the same thing to assassinate the president of the Deutche Bank in the 70's. Largely a satchel charge with a copper plate in the direction of the target, detonated by photocell detection or remote control. placement and aiming are critical otherwise the "projectile" flies off harmlessly or loses velocity fairly quickly. Easy to make IF you have the right materiels and the right technical skills. Find the guy whose making em (checnian most likely) or dry up the materiels(reliable high order plastic explosive and fairly thick 1/4-3/8 in copper or other fairly maleable metal, not al or lead and most steel/iron is not suitable) and they will dry up quick.
BTW keep in mind that if the media sitting in the bar at the hotel bagdad heard "someone" say that the insurgents were now using these --it will be reported as they are in fact in widespread use even if NONE have actually been detonated. Once the Toledo Pycaune reports this CNN,ABC NBC CBS and the NYT will quote "media sources" as reporting widespread use of these and that there is "no Known defense" "inadequate body armor" and "not enough armoured vehicles" as well as repeating "no plan" "pullout now" mantra's
ETA --sorry my mistake it was the Red army faction and it was 1989
Assassination of German Bank Chairman, November 30, 1989: The Red Army assassinated Deutsche Bank Chairman Alfred Herrhausen in Frankfurt.
Red Army Faction (RAF)
Description: The small and disciplined RAF is the successor to the Baader-Meinhof Gang, which originated in the student protest movement in the 1960s. Ideology is an obscure mix of Marxism and Maoism; committed to armed struggle. Organized into hardcore cadres that carry out terrorist attacks and a network of supporters who provide logistic and propaganda support. Has survived despite numerous arrests of top leaders over the years.
Activities: Bombings, assassinations, kidnappings, and robberies. With decline of world communism, has had trouble recruiting replacements for jailed members. Now concentrating on domestic targets, particularly officials involved in German or European unification and German security and justice officials. Carried out one operation in 1993, destroying a new prison with 600 pounds of commercial explosives. Police shootout with two members ended in death of GSG-9 officer and group member Wolfgang Grams. Group temporarily galvanized afterward. RAF has targeted US and NATO facilities in the past. During Gulf war, RAF shot up US Embassy in Bonn with assault rifle rounds. There were no casualties, however.
Strength: Ten to 20, plus several hundred supporters.
Location/Area of Operation: Germany.
External Aid: Self-sustaining, but during Baader-Meinhof period received support from Middle Eastern terrorists. East Germany gave logistic support, sanctuary, and training during the 1980s.