BEIRUT, Lebanon — Unidentified air strikes have killed 12 civilians in a rebel-held pocket of southern Syria as regime ally Russia presses talks for Damascus to retake the area, a monitor said Wednesday.

The deadly strikes late Tuesday hit Nawa, the last town under rebel control in the southern province of Daraa, the Syrian Observatory for Human Rights said.

The Britain-based monitor said it could not determine whether the strikes on the town in the west of the province were carried out by the regime or its Russian ally.

The regime has in less than a month retaken more than 90 percent of Daraa province, which borders Jordan and was the cradle of Syria’s ill-fated 2011 uprising.

But opposition fighters in Nawa — where tens of thousands of people live — have resisted.

After regime forces launched a ferocious offensive on June 19, Russia pressured rebels to hand over eastern parts of the province in early July, and the provincial capital last week.

Other towns in the west of the province have also joined the deal.

“Negotiations were ongoing Wednesday towards Nawa joining the reconciliation deal” with the regime for the wider province, Observatory head Rami Abdel Rahman said.

A ceasefire deal announced earlier this month between the regime and rebels in Daraa province did not include jihadists.

On Wednesday, Russian air strikes and regime barrel bombs targeted hills outside Nawa held by the Hayat Tahrir al-Sham group, led by Syria’s former Al-Qaeda affiliate.

Heavy air strikes also pounded a southwestern corner of the province controlled by the Islamic State jihadist group.

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