The Kurdish-led administration in Syria's northeast said almost 200,000 people had been uprooted so far by the fighting, while the U.N. World Food Programme put the figure at more than 100,000 in the towns of Tel Abyad and Ras al Ain.
He warned that the Turkish operation was opening the way for IS to regroup.
Turkish troops and allied Syrian opposition fighters have made gains recently capturing several northern villages in fighting and bombardment that left dozens of people killed or wounded.
Redor Khalil, a Kurdish official in the Syrian Democratic Forces, speaks during a press conference in Hassakeh, Oct. 12, 2019.
As The Washington Post's Liz Sly and Missy Ryan reported, "U.S. officials, speaking on the condition of anonymity to describe the evolving US strategy in Syria, said the Pentagon did not have enough forces to oversee the prisons if those facilities were left unguarded, nor a mandate to do so".
UK Prime Minister Boris Johnson spoke with Turkish President Recep Tayyip Erdogan on Saturday evening, expressing grave concern about the ongoing military operation in northern Syria.
"The UAE considers it necessary to play an active Arab role in Syria and to be spurred by this aggression to take necessary measures to confront any incursions against Arab territories".
The Arab League will contact the United Nations secretary general to transmit the content of the statement to all member states in the form of an official document.
Aksoy said the Turkish operation would proceed "with determination" in fighting "terrorist organizations" that are a threat to Turkey's national security.
A meeting in Luxembourg on Monday of the European Union's foreign affairs committee will decide on a coordinated European approach to the issue, a French statement said.
Reuters noted that Germany exported arms worth 243 million euros ($268m) to Turkey in 2018, accounting for nearly one-third of its weapons exports, according to Bild.
Turkey on Wednesday launched Operation Peace Spring to eliminate terrorists from northern Syria in order to secure Turkey's borders, aid in the safe return of Syrian refugees, and ensure Syria's territorial integrity.
Turkish officials posted photos on Saturday showing deserted streets and Turkish-backed Syrian rebels standing on Kurdish militia flags in Ras al Ain. Syrian Kurdish forces appeared to be holding out in some areas of the town.
"It will also go toward increased accountability, removal of explosive remnants of war, community security for stabilization assistance, documenting human rights abuses and global humanitarian law violations, and support for survivors of gender-based violence and torture", the statement continued.
On Friday in the Ibrahim sisters' Kurdish-held home city of Qamishli, Islamic State claimed responsibility for a deadly auto bomb, its first big attack since the Turkish assault began.
"The Kurds are deeply concerned this isn't just a campaign by Turkey against the Kurds because the Turks don't like the Kurds and they're punishing them somehow", Engel further explained. IS members tried to enter Ras al-Ayn following their rise in Syria and Iraq in 2014 but failed.