The Britain-based Syrian Observatory for Human Rights said the dead, who included five children, were killed in air strikes on the village of Jalbara. It is not clear how many Turkish soldiers are on the ground.
Turkey is a key ally against ISIS thanks to air bases that it allows the U.S.to use, so the defense secretary declined to characterize the US response to the weekend assault.
Noting that the overall success against Daesh "does not remove many of Turkey's concerns", Mattis said it is "easy to understand" why Ankara is anxious that the conflict will extend beyond the Syrian border.
Turkey's motivation to destroy the Kurdish fighters comes from their alleged connection to the PKK, a Kurdish group responsible for terror attacks in Turkey that both Washington and Ankara consider a terror group.
The population of Afrin is estimated at 200,000, many of whom will become refugees if Turkey succeeds. One Syrian refugee was killed in a Turkish border town following rockets launched from Syria.
Will they support a clash with North Atlantic Treaty Organisation ally Turkey, to keep armed Kurds on Turkey's border, when the Turks regard them as terrorists?
There is growing global concern that the Turkish offensive could ignite yet another humanitarian crisis in Syria.
Afrin canton is governed by the Kurdish-led Self-Administration, which is led by the powerful Democratic Union Party (PYD) and its armed wing, the People's Protection Units (YPG).
"We have discussed it with the Russians and we have an agreement with them", Erdoğan said in Ankara.
Talks under way to finalize North Korea participation in Winter Olympics
At the time , Kim said he would be willing to send a delegation to the Olympic Games being held in Pyeongchang, South Korea . The 22 North Korean athletes mark more North Koreans at a Winter Olympics than the last six Winter Games combined.
"If and when we have verification of people in need, wherever they move to we will be able to assist", al-Za'tari said.
As for Syria's Kurds casting their lot with the Americans, one wonders: Did they not observe what happened when their Iraqi cousins, after helping us drive ISIS out of Mosul, were themselves driven out of Kirkuk by the Iraqi army, as their USA allies watched?
Turkish jets pummeled USA -backed forces in Syria's north - all while Turkey holds one of the U.S.'s most important bases and dozens of US nukes.
"For people who are civilians I can only say that it's quite hard because the access that they have to basic necessities is rather constrained, the prices of commodities are high (and) medical services are low", said al-Za'tari.
He said: 'We recognise Turkey has a legitimate interest in the security of its borders. "We're training them, we're trying to use worldwide policing standards in order to make sure they're trained properly".
Speaking in Ankara Monday, Erdogan asked the US: "Why are you fighting against ISIS with another terrorist organization?" "We're not occupying that place, we're just making sure it gets turned over responsibly to the locals and that the locals have a seat at the table in Geneva".
Meanwhile, the Turkish Foreign Minister Mevlut Cavusoglu insists that the claims of civilian casualties from the offensive were untrue.
Turkey's military operation, dubbed "Olive Branch", has put the entire region on the brink of another crisis and outraged most of the Middle East.
"It's a fact that United States forces are seriously involved in creating alternative government bodies on vast part of the Syrian territory".
"This is a force that holds", he said.