KOBANI, Syria — Turkey’s military suffered its worst day yet in the two-week offensive in Afrin, Syria, when at least seven soldiers were killed and a tank was destroyed in the fighting, official Turkish news outlets reported on Sunday.

But the losses may be higher, according to other reports.

Mustafa Bali, a spokesman for the Kurdish-led militia defending the city in northern Syria, the Syrian Democratic Forces, said its fighters had killed eight Turkish Army soldiers in two episodes northeast of the city on Saturday. Two tanks were destroyed, he said.

An independent monitoring group, the Syrian Observatory for Human Rights, said that two tanks had been destroyed and that 19 Turkish soldiers and allied Syrian militiamen had been killed in total on Saturday.

It was the single biggest one-day loss for the Turkish forces since they pushed into Syria on Jan. 20, vowing to take the enclave from the Syrian Democratic Forces, which Turkey describes as terrorists. The losses bring to at least 14 the number of Turkish soldiers killed in the offensive so far.