Iran congratulates the Syrian nation, government and army on the success of the Syrian military forces in recapturing the strategic Syrian town of al - Qusayr.

Tehran " congratulates the victory of the Syrian army and people over the Takfiri terrorists, " said Iran ' s Deputy Foreign Minister Hossein Amir Abdollahian on Wednesday.

He also condemned certain countries that facilitate the shipment of arms to the militants in the Arab country for the massacre of the Syrian people, emphasizing that those behind the carnage in Syria must be tried for war crimes.

" Certain parties continue to send arms and support terrorist actions in Syria, " Abdollahian said, adding they " are responsible for massacres and destruction in Syria and should be tried for war crimes. "

The remarks came after Syria ' s army on Wednesday took full control of the western town near the Lebanese border after an offensive against foreign - backed militants that lasted almost three weeks.

Syrian state television said that the Syrian troops also killed a large number of terrorists and captured other militants in the western town in Homs Province.

The foreign - backed militants also said in a statement that they withdrew overnight Wednesday from the town after the Syrian troops " killed hundreds " of terrorists.

Syrian officials say new military gains have shifted the balance of power in the government ' s favor in recent weeks.

In the past two months, the Syrian army has moved steadily against the terrorists in key battleground areas, making advances near the border with Lebanon and considerably lowering the threat to Damascus.

Syria has been gripped by unrest for more than two years. The foreign - sponsored militancy has taken its toll on the lives of many people, including large numbers of Syrian soldiers and security personnel.