Unidentified jets hit buildings and trucks being used by Iran-aligned militia groups in the Syrian town of Albukamal along a strategic border crossing with Iraq late on Friday, Iraqi security and border officials told Reuters.
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A local commander with Iraq's Popular Mobilisation Forces (PMF), a group of mainly Shi'ite Muslim armed groups also known as Hashid Shaabi, said four people were killed in the strikes, without giving details of their nationalities.
However, the commander denied that any of the groups' fighters deployed near the Syrian borders had been killed or wounded.
The strikes targeted an eight-truck convoy, destroying at least four trucks, said the sources who have contacts with the Syrian border officials. The officials said three buildings used by one of the Iranian-backed militia groups were also targeted.
Fighters allied with Iran, including Hezbollah, now hold sway in vast areas in eastern, southern, and northwestern Syria and several suburbs around the capital.
A U.S. military official said the U.S. did not conduct any defensive strikes overnight.