Isis secrets exposed

In How an arrest in Iraq revealed Isis's $2bn jihadist network Martin Chulov describes an arrest by Iraqi intelligence that exposed how wealthy Isis is.

Several hours later, the man he had served as a courier and been attempting to protect, Abdulrahman al-Bilawi, lay dead in his hideout near Mosul. From the home of the dead man and the captive, Iraqi forces hoovered up more than 160 computer flash sticks which contained the most detailed information yet known about the terror group.

The treasure trove included names and noms de guerre of all foreign fighters, senior leaders and their code words, initials of sources inside ministries and full accounts of the group's finances.

Quite a breach of operational security.