As a reminder: 10 January 2016 – Isis ‘ran sophisticated immigration operation’ on Turkey-Syria border:
‘Most of the registered passengers were travelling from within Isis-held territory. One manifest shows a group of five male and female Tunisians aged 23-36 entering the area. They are registered as coming from Kairouan, a city south of the Tunisian capital, Tunis, known to be a hotbed of radicalism. Kairouan is where gunman Seifeddine Rezgui, who massacred 30 British tourists on a Sousse beach in June, was studying. Tunisia is the biggest source of foreign fighters entering Syria. In October, the Tunisian government estimated that 6,000 fighters had left Tunisia headed for the conflict. Turkey has long said that it is unable to secure its 500-mile border with Syria. In January, as Isis was logging people passing in and out of Tel Abyad, the Turkish prime minister, Ahmet Davutoğlu, told the Independent that sealing the border would be impossible. “We cannot put soldiers everywhere on the border. In any case, there isn’t any state on the other side [of the frontier].” he said.
A Turkish diplomat speaking to the Guardian last month re-emphasised how difficult it was to stop fighters sneaking across the border at night.’