The Turkish assault aims to carve out a zone of control the length of the border - a so-called "safe zone" - clearing out the Kurdish militia.
Separately, the ministry said 49 more "terrorists" were "neutralized" in the incursion, in reference to Syrian Kurdish fighters.
Turkey considers the Syrian Kurdish fighters terrorists linked to a Kurdish insurgency within Turkey and says the offensive is necessary for its own national security.
President Trump faced widespread criticism in Washington this week after he announced that he would withdraw US forces from the region ahead of the Turkish military operation.
President Donald Trump: "Now the Kurds are fighting for their land, just so you understand". Prime Minister Scott Morrison said he had been in contact with the Turkish and USA governments overnight and admitted to being anxious about the situation. "I am watching closely".
Turkey launched airstrikes and shelling against Syria on Wednesday which was followed by thousands of civilians getting displaced a day later as the conflict got flagged as a developing humanitarian crisis.
Trump initially defended his move saying he had been elected on "getting out of these ridiculous endless wars" and that "Turkey, Europe, Syria, Iran, Iraq, Russia and the Kurds will now have to figure the situation out".
An estimated 450,000 people live within 3 miles of the border, according to a joint statement issued Thursday by a coalition of 14 global aid agencies.
That, the official said, "would include ethnic cleansing" of Kurdish areas in northern Syria and "in particular, indiscriminate artillery, air and other fires directed at civilian populations".
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Turkish authorities want the "safe zone" to extend 32 km into northern Syria, stretching from the Euphrates River to the Iraqi border.
Among those killed were two children and one was injured by the bombing of Turkey against the city of Qamishli, one of the most populous cities in the territory controlled by the Kurdosyrians and where Damascus also dominates an area, including the airport.
An SDF Twitter account said an attack by Turkish forces east of the Jalab river had been repelled, with three military vehicles destroyed and 22 enemy combatants killed.
The U.N. Security Council is expected to meet later today.
Turkey President Erdogan defiantly declared on Thursday that he would permit Syrian refugees in Turkey to move to Europe if European Union countries described his forces' move as an occupation.
Cavusoglu reiterated the proposal later Thursday. "We, however, take action and that is the difference between us". Trump announced the pullout of some 50 United States troops from the Syrian-Turkish border region, where they were advising and supporting Kurdish YPG and YJ militias.
"We have one of three choices", he wrote.
"I say hit Turkey very hard financially & with sanctions if they don't play by the rules!"
Republican Senator Lindsey Graham, usually a Trump ally, repeated his calls for sanctions on Turkey over its invasion.