At least 500 Takfiri militants have crossed the Turkish border with Syria and are heading towards a northern Syrian border town, a UK-based monitoring group says.

"At least 500 rebels have crossed the Bab al-Salam border crossing on their way to the town of A'zaz, from which they want to help the insurgents in the face of gains made by Kurdish forces in the north of the province," said Rami Abdel Rahman, the head of the so-called Syrian Observatory for Human Rights.

The Wednesday's crossing marks the second time a large group of militants have crossed the Turkish border and entered Syria in less than a week. On Sunday, 350 heavily armed terrorists entered Syrian soil via the Atme border crossing with Turkey, presstv.ir reported.

On Tuesday, a Turkish official said the only solution to the troubles in Syria is the deployment of ground troops. Turkish Foreign Minister Mevlut Cavusoglu seconded the proposal, adding that his country is currently discussing such measures with its allies.

Over the last few days, Ankara has been targeting Kurdish People's Protection Units (YPG) positions in an attempt to stop Kurdish forces from reaching the Syrian border with Turkey, while Syrian forces have been making daily gains against Daesh Takfiri terrorists in the northern regions.

On Wednesday, President Recep Tayyip Erdogan announced that Turkish forces will continue to shell Kurdish positions in Syrian soil.