Russian Foreign Minister Sergey Lavrov said Russia has evidence of Turkey's "creeping expansion" in northern Syria.
"According to our information, they are digging in a few hundred meters from the border inside Syria," Lavrov said in an interview with Russian REN TV broadcast today.
In southeastern Turkey, authorities have imposed curfews in several flashpoints since August to root out militants linked to the Kurdistan Workers' Party, or PKK, who had set up barricades, dug trenches and planted explosives.
The announcement came as news reports said dozens of tanks had been deployed to the town.
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Soon after, authorities in Mardin province announced that a round-the-clock curfew would take effect in the town of Nusaybin on the border with Syria at midnight.
Turkey's military last week ended a three-month operation against the militants in the historic Sur district of Diyarbakir the largest city in the country's mostly Kurdish southeast. Today, authorities eased the curfew in some streets and one neighborhood of Sur, but the siege over the district's main areas was still in place.