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Turkey's president warned on Monday that conflict with Syria had reached a "worst-case scenario," as the neighboring countries exchanged fresh cross-border shelling for a sixth straight day. President Abdullah Gul called on the international community to help end the civil war in Syria that many now fear will engulf the region as a whole. Earlier in the day, U.N. Secretary-General Ban Ki-moon had warned that the situation on the Syrian–Turkish border was indeed "extremely dangerous."