In this image grab taken from a broadcast by Syria TV on June 28, 2021, smoke billows from a facility used by Iran-backed groups following US air strikes on the Syrian-Iraqi border. US air strikes against Iran-backed armed groups on the Syrian-Iraqi border killed at least seven fighters overnight into Monday and sparks immediate calls for revenge, with rocket fire targeting a US military base in Syria's eastern province of Deir al-Zour on Monday evening, state news agency SANA reported. (SYRIA TV / AFP)

DAMASCUS - Rocket fire targeted a US military base in Syria's eastern province of Deir al-Zour on Monday evening, state news agency SANA reported.

The targeted base is located in the al-Omar oil field in the eastern countryside of Deir al-Zour, SANA said, without providing further details.

The exchange of fire comes after the US carried out a missile strike at 1 am on Monday on pro-Iranian fighters' positions in the eastern countryside of Deir al-Zour near the Iraqi border

Meanwhile, the pro-rebel Syrian Observatory for Human Rights said the attack caused damage and burned cars in the base, without any mention of casualties.

The Britain-based watchdog noted that pro-Iran fighters were behind the rocket fire.

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Following the attack, areas under the control of the pro-Iranian fighters in the al-Mayadin city in Deir al-Zour witnessed several explosions, which appeared to be retaliatory shelling from the targeted US base in the al-Omar field, said the Observatory.

The exchange of fire comes after the United States carried out a missile strike at 1 am on Monday on pro-Iranian fighters' positions in the eastern countryside of Deir al-Zour near the Iraqi border, killing five.  

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Washington claims that pro-Iran militiamen are responsible for attacks against US positions in Iraq.