U.N. Secretary-General Ban Ki-moon is warning of the dangers of the escalating conflict along the Syria-Turkey border, as well as the effects of the Syrian crisis on neighboring Lebanon.

Turkey has launched retaliatory mortar fire at Syria for five days after shells from Syria killed five Turkish civilians in the southeastern border village of Akcakale.

Mr. Ban on Monday described the situation along the border and the impact on Lebanon as “extremely dangerous.”

He also said he is “deeply concerned” about the continuing flow of weapons to the Syrian government and opposition forces. He reiterated calls for a political solution, which he said is the “only way” to resolve the crisis that began in March of last year.

The violence continued Monday, with Syria's state-run SANA news organization reporting that government forces killed “scores of terrorists” in Aleppo.

The Syrian government refers to rebels fighting against Syrian President Bashar al-Assad as “terrorists.”

On Sunday, Syrian troops pressed their offensive to retake rebel-held areas in Aleppo, Homs, towns around the Syrian capital Damascus and southern villages on the border with Jordan.

The Britain-based Observatory said 120 people were killed nationwide on Sunday. The group gathers its data from a network of activists, medics and lawyers on the ground in Syria.