Hundreds of British extremists could return to the UK if jihadist groups start to lose battles in Iraq and Syria, the country's most senior police officer has warned.
Scotland Yard chief Sir Bernard Hogan-Howe said it cannot be predicted when potential terrorists might decide to return home, and police are preparing in case of an influx.
It is estimated that around 500 Britons have travelled to Syria to fight alongside extremists there, of whom around half are thought to be from London.
Sir Bernard said there are "a significant number of people who run the risk of being radicalised, militarised and potentially desensitised to violence, who one day we assume will come home".
Kurdish Peshmerga fighters have emerged victorious in the battle for Mosul Dam, but the question is - what will their next move be?
An ITV News team at Mosul Dam was with victorious Kurdish Peshmerga fighters at the complex earlier today.
ITV News joined a Kurdish unit fighting Islamist militants near Irbil and found them using tanks from the 1950s and short on ammunition.