Jack Letts, nicknamed "Jihadi Jack" by some newspapers, suffers from a serious mental disorder, according to his parents, Channel 4 News can reveal.
A London conference aims to raise over £6 billion to help Syria's neighbours provide for thousands of refugees. But in Geneva separate peace talks hoping to end the Syrian conflict collapse.
A British mother who took her child to Syria to join Islamic State fighters has been jailed for six years.
The director-general of the World Health Organisation warns that possible links between the Zika virus and babies with abnormally small heads are causing "extremely high" levels of concern.
Pregnant women are advised to avoid countries that have seen outbreaks of the mosquito-borne Zika virus, which doctors are linking to unusually high numbers of babies born with brain defects.
A snowstorm threatens to bring major cities in the north east US to a halt in the coming days, with feet of snow expected.
Russia's President Vladimir Putin "probably" approved the fatal poisoning of former Russian agent Alexander Litvinenko with radioactive polonium in London in 2006, a public inquiry has found.
Militants open fire on students and staff at a university in Charsadda, in north-west Pakistan, killing at least 19 and injuring scores more.
A new website giving parents and teachers advice on protecting children from extremism is being launched by the government as it seeks to combat "the spell of twisted ideologies".