U.S. and NATO ally Turkey has been key to ISIS's military victories in Syria and Iraq.
An excerpt from, "Turkey could take in Muslim Brotherhood leaders ousted from Qatar, Erdogan says" AP, September 16, 2014:
Erdogan also told a group of journalists on board his plane during his return from a visit to Qatar late Monday that Turkey could take in leaders of Egypt’s Muslim Brotherhood who have been asked to leave Qatar.Title: ISIL Militants Filmed on a Tram in Istanbul as Erdogan Paves the Way for Jihadis to Attack Syria. Source: Eretz Zen. Date Published: September 19, 2014. Description:
Erdogan also told reporters that Turkey could provide refuge to Muslim Brotherhood leaders now being forced to leave Qatar.
The leaders had sought refuge in Qatar following the ouster of Egypt’s Islamist President Mohammed Morsi and the crackdown on his supporters. But their presence in Qatar had severely strained Doha’s relations with Egypt as well as with Saudi Arabia and the United Arab Emirates, all of which view the more than 85-year-old Islamist movement as a threat.
A couple of Iraqi nationals have recently spotted two militants from the "Islamic State" (aka ISIL or ISIS) terrorist group riding a tram in Istanbul. They managed to film them with a mobile phone.
This comes amid Western hints and accusations that the Turkish government is providing support for ISIL, not only by facilitating their entry into Syria from its territories but also by providing them with shelter, medical treatment, and weaponry. Turkey has also decided not to participate in the anti-ISIL military coalition that is being led by the US and even includes such terror-sponsoring states as Saudi Arabia and Qatar.