Why was the Boston bombing suspect Tamerlan Tsarnaev not picked up by the FBI and FSB during his trip to and from Dagestan, despite being firmly on their radar?
A first glimpse of some powerful footage from Syria should make us stop and think about the complexities of the war there.
The Syrian government has carried out repeated, indiscriminate and sometimes deliberate, air strikes against civilians, a report from Human Rights Watch says.
United Nations talks with the Syrian government over an investigation into the alleged use of chemical weapons have reached an impasse, UN diplomats say.
Reporting on Syria's civil war is proving a dangerous business, but is the reluctance of media organisations to tell of the true risks actually doing the public a disservice?
Everybody knows the only people out on the streets after dark are rebel fighters or the army taking them on, but for a mother of three boys the daily battle is for rent, gas for heating and cooking an
Syrian rebels have amassed large arsenals of weapons - through smuggling and raids on government facilities. Channel 4 News reveals some of the weapons being used against Bashar al-Assad's government.
Jihadists are increasingly prominent in the fight against the Syrian government, which has so far claimed over 70,000 lives. Channel 4 News maps the gains made by the most powerful groups.