BEIRUT: An attack in eastern Syria killed 12 oil field workers, a war monitor said on Friday, a day after Syrian Kurdish-led forces announced an offensive against fighters.
The British-based Syrian Observatory for Human Rights, which draws on extensive sources inside Syria, gave the toll of a dozen dead in the assault near an oil field west of Deir Ezzor.
It blamed cells linked to the IG group. The fighters have previously carried out attacks in the area, and a similar deadly assault took place last year. Syria's state news agency SANA gave a toll of 10 dead in the "terrorist attack that targeted three buses transporting workers" from Al Taim oil field, which is under Syrian government control.
Despite the defeat of its "caliphate" in Syria by US-backed Kurdish forces nearly four years ago, IS continues to claim attacks in Syria and across the border in Iraq.
"The attack began with explosive devices that went off as the buses drove by, and then the group's militants shot at them," Observatory director Rami Abdel Rahman said.
On Thursday, the Kurdish-led Syrian Democratic Forces (SDF) said they had begun an offensive against IS, following a recent fighter assault on a prison in Raqa, northwest of the attack on the bus.
The SDF, which regularly launches operations against the fighters, said its latest offensive aimed to eliminate IS from areas that had been "the source of the recent terrorist attacks".
It said it was carrying out the operation alongside a US-backed anti-IS coalition, although the international force did not immediately confirm its participation.
In addition to the thwarted Raqa prison attack, SDF said IS fighters had recently carried out eight assaults in the Deir Ezzor area, Hasakeh and the Al Hol camp for displaced people, which houses family members of IS fighters.
The SDF on Friday said 52 IS "mercenaries and facilitators" had been arrested in residential areas during its newly launched operation.
On Monday, the SDF said six Kurdish fighters were killed when IS attacked a security complex in Raqa, the fighters' former de facto capital in Syria, in a bid to free imprisoned militants.
Referring to recent Turkish airstrikes on Kurdish forces in northeast Syria, the SDF said IS was trying to "take advantage" of the situation.
Turkey backs rebels in Syria's northern border zone, but opposes Syria's Kurds, which it sees as inextricably linked to Kurdish "terrorists" at home.
After IS seized vast areas of Iraq and Syria in 2014 it ruled with brutality until local forces backed by the US-led coalition defeated them, first in Iraq in late 2017.
More than a year later the SDF, which spearheaded the fight against IS in Syria, drove the group from Baghuz, its last stronghold there.
IS said Monday's attack on Raqa aimed to avenge "prisoners" and female relatives of fighters in Al Hol camp.
The Observatory blamed "a base of militias" for a November 17 rocket strike which targeted the US-led coalition's Green Village base, roughly 50 kilometres from the bus attack.
Green Village is in Syria's largest oil field, Al Omar. There were no reported injuries in that incident.
In January, fighters killed nine Syrian soldiers and allied militiamen near oil installations on the edge of Deir Ezzor, the Observatory said at the time.
That was about a month after an attack on a bus carrying oil workers reportedly killed at least 10.
Syria's war began with the brutal repression of peaceful protests in 2011 and escalated to pull in foreign powers as well as the fighters.
Russia's military intervention in 2015 helped turn the tide in favour of Syria's President Bashar al Assad. - AFP
Oman Observer is now on the WhatsApp channel. Click here
