The Syrian Center for Human Rights said on Monday that "in the last few hours, Iranian militias have poured new military reinforcements and weapons into a base located opposite the areas of the international coalition and the Syrian (Kurdish) democratic forces."

The Observatory cited unidentified sources who said the weapons included a number of medium-range "surface-to-surface missiles", weapons and ammunition shipped from areas west of the Euphrates to their new base, recently established on a hill in the village of Habuba.

The Syrian Observatory said that this was the second time the militias had been pouring reinforcements for 20 days, without knowing what the purpose behind it was.