The images show that al-Mazzeh facility was constructed underground after January 2017 and was hit on April 27. The photos illustrate the precision of the strikes. They show that the strikes targeted only a small part of larger compounds and warehouses.
In this case, it appears just one warehouse was hit near Palmyra. At al-Mazzeh airport it was an underground level. This area has been hit before.
Iran has been accused of transferring precision guided munitions to Hezbollah via Syria. It also uses Shi’ite militias, some of them from Iraq, to carve out a corridor of influence across Iraq that stretches from an Iranian base called Imam Ali near Albukamal on the Syria-Iraq border to a base called T-4 near Palmyra.
Recent videos posted online showed members of the Fatimiyoun Afghan Shi’ite militia near Albukamal riding on a Syrian regime T-90 tank. This shows that pro-Iranian elements are not afraid to make their presence known.
The Fatimiyoun have threatened to attack Israel in the past. They were recruited among poor Afghans and are paid by the IRGC to serve in Syria.