A British man turned poster boy for the terror group Isis has warned that he will "fight anyone who wants to fight against Islam".
Abdul Raqib Amin, who grew up in Aberdeen before travelling to Iraq to join the militant group, told Good Morning Britain there are thousands of recruits joining the fighters from around the world.
Raqib said that the group would not attack the UK "yet", but said that Britons were Kuffars, meaning disbelievers, as he issued a stark warning that the group were ready to attack anyone who went against them.
"Whoever opposes us, who goes against Islam, we fight anyone who wants to fight against Islam," he said.
Raqib has been identified as one of the British militants in a recruitment video for Isis, alongside fellow British jihadists Nasser Muthana and Reyaad Khan. In it, he said that he had suffered from depression while living in the West, before adding: "The cure for the depression is jihad.”
The Government has frozen the assets of three British citizens reported to have been involved in terrorism-related activities in Syria.
Nasser Muthana and Reyaad Khan, both from Cardiff, and Ruhul Amin, from Aberdeen, has been added to the Treasury's list of people targeted for financial sanctions, its website states.
Muthana and Amin appeared in a promotional video for the Islamist militant group Isis.
The brother of a British jihadi fighter who featured in an Isis promotional video in Syria says he was not radicalised by his local mosque.Read the full story ›
An estimated 500 British people are currently fighting in Syria, but the number could be far higher, the UK's counter-terrorism chief for the Association of Chief Police Officers told ITV News.
Sir Peter Fahy said many British families reported that young men in their family have gone abroad, but are not sure where.
"We know that a number of people have gone to areas like Turkey, a number of families have reported that the young men in the family have gone abroad, they're not sure where," he said.
A major terrorism trial can partly be held in secret, the Court of Appeal has ruled.
A 19-year-old man arrested at Heathrow airport on suspicion of "Syria related" terrorism offences has been released on bail, the Metropolitan Police have said.
Officers have since completed the search of an address in the Camden area of north London.
In a statement, the police said the arrest is "not in response to any immediate risk or threat".
A second man also arrested at the airport on Saturday on suspicion of assisting terrorism in Syria is still being held in custody.
A 20-year-old British man has been arrested at Heathrow airport on suspicion of assisting terrorism in Syria.
The Briton is the second man to be arrested at the busy airport on suspicion of terror offences today.
Earlier, a 19 year-old was held on suspicion of preparing for acts of terrorism in what police described as a "Syria-related" incident.
Police said the two arrests are not connected. Both men remain in custody in London.
The terror-related arrest of a teenager at Heathrow airport was not made in response to any immediate risk or threat, police said.
A 19-year old man has been arrested on suspicion of "preparing for acts of terrorism" in relation to Syria.
The man is currently held at a police station in London.
A 19-year old man has been arrested at Heathrow airport on suspicion of "preparing for acts of terrorism" in relation to Syria, police said.
The man is being held at a police station in London and an address in the north of the city is being searched, the Metropolitan police said in a statement.
A British father-of-two has become the first person in the UK to be convicted of travelling to Syria to learn how to wage war.
A London court heard how Mashudur Choudhury, who was arrested last October, had openly talked about becoming a "martyr".
ITV News' Lewis Vaughan Jones reports.