Turkey has called on members of the U.S.-led coalition against Islamic State to provide air support for Turkey-backed troops laying siege to the Syrian town of al-Bab, held by fighters from the group, Reuters reports.
"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.