BREAKING NEWS: Anti-terror police surround building in hunt for three suspects, including two brothers 'trained in Yemen as assassins', over Paris magazine massacre that left 12 dead

• One suspect killed and two others in custody, US counter-terrorism officials claim, but this has not been confirmed
• Masked gunmen storm Paris headquarters with AK-47s shouting 'Allahu akbar!' and 'the Prophet has been avenged'
• Stalked building asking for people's names before killing the editor, three cartoonists and the deputy chief editor
• Editor Stephane Charbonnier had famously shrugged off threats, saying: 'I'd rather die standing than live kneeling'
• Horrific footage shows a police officer begging for his life before being shot in the head at point-blank range
• Cartoonist Corrine Rey told how she cowered with her young daughter as she watched two colleagues gunned down
• Killers fled in stolen car across eastern Paris after a 'mass shoot-out' with police officers and remain on the loose  
• Militants believed to be from Al Qaeda in the Arabian Peninsula which was behind plane bomb plots in US and UK
• Three suspects said to be all French citizens - a homeless teenage man aged 18, and two brothers aged 32 and 34
• Newspaper had earlier posted a picture of Islamic State leader Abu Bakr al-Baghdadi on its Twitter account
• Publication's offices were firebombed in 2011 for publishing satirical cartoon of Prophet Mohammed
• White House had previously criticised Charlie Hebdo in 2012 for publishing its religiously sensitive cartoons

By Mark Duell [5] and Simon Tomlinson [6] and Peter Allen [7] and Jay Akbar [8] and Chris Pleasance for MailOnline [9]

Published: 06:16 EST, 7 January 2015 | Updated: 19:13 EST, 7 January 2015