The reports came from various media outlets in the eastern area of Al-Bukamal and from credible Syrian opposition websites
It is likely part of the Iranian effort to gain control of the key route without the Syrian army — or any other force — being able to have any influence.
Israel has been following the developments in that area, fearing that Iran could succeed in establishing a land corridor to the Mediterranean that would pose a significant threat to the Jewish state. Prime Minister Benjamin Netanyahu has long been campaigning internationally against Iranian presence and influence in Syria, and has lately been seeking to convince Russia to expel all Iranian forces from Syria.
Over the last few months there has been an Iranian effort to establish a presence around the border crossing, and the commander of the Islamic Revolutionary Guard Corps’ Quds Force, Qassem Soleimani, has been seen there several times.