A senior Iranian security official pledged on Saturday the full support of Tehran for the Syrian regime, its close ally, Syrian state television said.

"We will give all our support so that Syria remains firm and able to face all the arrogant (Western powers') conspiracies," said Saeed Jalili, who heads the Supreme National Security Council and who is visiting Damascus, as reported by AFP.

"The Israeli aggression and arrogant international forces have tried to take revenge by attacking the resisting Syrian people," said Jalili, who described Israel and the West's attempts as "desperate."

Jalili was referring to an alleged Israeli air strike on Wednesday that a US official said hit a military complex and missiles near the Syrian capital.

The Syrian army said the raid, which Israel has never confirmed or denied, targeted a military research centre located between Damascus and the Lebanese border.