Rebel fighters gather during their advance towards the ISIS-held city of al-Bab, northern Syria, on October 26, 2016.

Turkey on Monday called on members of the US-led coalition against ISIS to provide air support for Turkey-backed troops laying siege to the Syrian town of al-Bab, held by fighters from the group.

“The international coalition must carry out its duties regarding aerial support to the battle we are fighting in al-Bab. Not giving the necessary support is unacceptable,” President Tayyip Erdogan’s spokesman, Ibrahim Kalin, told a news conference.

Rebels supported by Turkish troops have laid siege to the town for weeks in the ‘Euphrates Shield’ operation launched by Turkey nearly four months ago to sweep the hardliners and Kurdish fighters from its Syrian border.

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