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       Turkish F-16s reportedly begin hitting Syrian border towns Turkey has begun targeting ammunition depots and open fields being used by Kurdish forces, according to reports on the ground; Trey Yingst reports.

       A planned Turkish military operation in northern Syria has now begun, the country's president announced Wednesday, as Kurdish fighters say warplanes are already bombing civilian areas in the region.

       President Recep Tayyip Erdogan tweeted that the maneuvers being carried out against Syrian Kurdish forces – which Ankara considers terrorists allied with a Kurdish insurgency within Turkey – are part of Operation Peace Spring.

       "Our mission is to prevent the creation of a terror corridor across our southern border, and to bring peace to the area," he said in a tweet. "#OperationPeaceSpring will neutralize terror threats against Turkey and lead to the establishment of a safe zone, facilitating the return of Syrian refugees to their homes."

       A spokesperson for the Kurdish-led Syrian Democratic Forces says Turkish warplanes have "started to carry out airstrikes on civilian areas", causing a "huge panic among people of the region."

       TURKISH INCURSION INTO SYRIA WOULD FORCE KURDS TO FLEE, FREEING CAPTURED ISIS MEMBERS, GEN. KEANE SAYS

       The Kurds -- who have been longtime U.S. allies in the fight against ISIS in Syria -- requested air support from American forces in response to the strikes. But U.S. military officials tell Fox News that President Trump has ordered them to not get involved.

       A small group of Turkish forces first entered northeastern Syria Wednesday morning near the towns of Tal Abyad and Ras al-Ayn, Bloomberg reported. Turkey's state-run Anadolu news agency later said Turkish artillery units have been shelling suspected Syrian Kurdish targets in Tal Abayd, while two mortar shells fired from Ras al-Ayn struck the Turkish border town of Ceylanpinar. No injuries were reported in the latter attack.

       The developments come after the Kurds called on their people Wednesday to move toward the border with Turkey and “carry out acts of resistance.

       "We call upon our people, of all ethnic groups, to move toward areas close to the border with Turkey to carry out acts of resistance during this sensitive historical time," read a statement from the local civilian Kurdish authority known as the Autonomous Administration of North and East Syria.

       In its call for “general mobilization,” the Kurds also urged the international community to live up to its responsibilities as "a humanitarian catastrophe might befall our people" in the region.

       A Turkish army tank is driven to its new position, after was uploaded from a truck, on the Turkish side of the border between Turkey and Syria, in Sanliurfa province, on Tuesday. (AP)

       The stark message was in contrast to what was being said Wednesday north of the border.

       Fahrettin Altun, the Turkish presidency's communications director, called on the international community in a Washington Post op-ed "to rally" behind Ankara, which he said would also take over the fight against the Islamic State terrorists.

       Turkey also is aiming to "neutralize" Syrian Kurdish militants in northeast Syria and to "liberate the local population from the yoke of the armed thugs," Altun added.

       SEN. MCSALLY SAYS US SHOULD STAND WITH KURDS

       A Syrian war monitoring group, the Britain-based Syrian Observatory for Human Rights, reported Wednesday that people were already fleeing Tal Abyad as the Turkish troops are closing in.

       Trump defends Syria troop withdrawal, issues warning to Turkey

       President Trump is battling criticism from Kurdish protesters and his own party for his decision to pull U.S. troops from Syria; Lucas Tomlinson reports from the Pentagon.

       Turkish officials who spoke to Bloomberg on condition of anonymity say the offensive will target Syrian border towns first to minimize any chance of a Kurdish state growing near its territory.

       Expectations of a Turkish invasion rose after President Trump on Sunday abruptly announced that American troops would step aside ahead of the Turkish push — a shift in U.S. policy that essentially abandoned the Syrian Kurds.

       But Trump also threatened to "totally destroy and obliterate" Turkey's economy if the Turkish push into Syria went too far, and cast his decision to pull back U.S. troops as fulfilling a campaign promise to withdraw from the "endless war" in the Middle East.

       FRENCH OFFICIALS CRITICIZE US OVER ANNOUNCED MILITARY PULLBACK

       President Trump signs off on US withdrawal from northern Syria as Turkey plans invasion

       For the past four years, the Kurds helped the U.S. fight ISIS; Trey Yingst reports from Jerusalem.

       The moves have been met with criticism from politicians on both sides of the aisle.

       Republican critics included Sen. Martha McSally of Arizona, who said she hopes the president's plan is "reconsidered."

       "I agree with President Trump's objective to not be bogged down in the Middle East, to bring our men and women home, and we really need to be looking at the rising threat of China," McSally said on "The Story with Martha MacCallum" Tuesday.

       "However, we have a generational struggle and fight against Islamic terrorism,” she added.

       Meanwhile, Russian Foreign Minister Sergey Lavrov accused Washington of playing "very dangerous games" with the Syrian Kurds saying that the U.S. first propped up the Syrian Kurdish "quasi-state" in northeastern Syria and is now withdrawing its support.

       "Such reckless attitude to this highly sensitive subject can set fire to the entire region, and we have to avoid it at any cost," he said during a visit to Kazakhstan.

       Turkish forces artillery pieces are seen on their new positions near the border with Syria in Sanliurfa province on Sunday. (AP/DHA)

       Earlier on Wednesday, ISIS militants targeted a post of the Syrian Democratic Forces in the northern Syrian city of Raqqa, which was once the de facto ISIS capital at the height of the militants' power in the region.

       The SDF, which is holding thousands of ISIS fighters in several detention facilities in northeastern Syria, has warned that a Turkish incursion might lead to the resurgence of the extremists. The U.S. allied Kurdish-led force captured the last ISIS area controlled by the militants in eastern Syria in March.

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       In Wednesday's attack, ISIS launched three suicide bombings against Kurdish positions in Raqqa. There was no immediate word on casualties.

       Also Wednesday, Iranian state television reported a surprise military drill with special operations forces near the country's border with Turkey, in Iran's Western Azerbaijan province. The TV didn't mention the expected Turkish offensive into Syria or elaborate on the reasons for the drill.

       Fox News’ Jennifer Griffin, Lucas Tomlinson, Victor Garcia, Dom Calicchio and the Associated Press contributed to this report.