In a statement Wednesday, Doctors Without Borders said local residents reported the city of Deir el-Zour is being ‘‘shelled and bombed daily.’’ There is only one makeshift hospital with four doctors in Deir el-Zour, and those doctors are ‘‘completely exhausted after six months of working in a combat zone,’’ said Patrick Wieland, a coordinator for the group. He said it is ‘‘virtually impossible to obtain medical supplies’’ in the besieged city.

In northern Syria, rebels clashed with pro-government Kurdish gunmen near the city of Ras al-Ayn along the border with Turkey, according to an official in the mayor’s office in the Turkish border town of Ceylanpinar. At least 17 wounded Syrians were brought over to Turkey for treatment, and several died, the official said.

The official spoke on condition of anonymity because Turkish government rules bar civil servants from speaking to journalists without prior authorization.

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