From the rise of the far-right in the US and across Europe, powerful natural disasters, and the #metoo movement, to the Rohingya refugee crisis, 2017 has witnessed it all. We take a look back at the year in pictures.
Salman Abedi, the Manchester attacker, travelled between the UK and Libya where he was under surveillance by local authorities. Yet Abedi easily returned to Britain, where he built and detonated a bomb.
Manchester bomber Salman Abedi grew up in neighbourhoods around south Manchester. Some in the area say poverty and under-funded social services are isolating young people and turning them against their communities.
The latest arrest was of a 23-year-old man in Sussex. Britain has lowered its security level from "critical" to "severe," meaning the country remains on high alert a week after the suicide attack killed 22 at a concert in the northern English city.
The UK has tightened its security following a bombing in Manchester, but people in the capital London try to continue with their daily lives as normal.
Britain's Interior Minister Amber Rudd said there is a possibility the perpetrator, Salman Abedi, did not act alone and confirmed he was known to security services.
With the UK still reeling from a terrorist attack, the British Prime Minister Theresa May made a late night statement warning that another might be on the way.
A suspected terror attack hit Manchester on Monday night after US pop singer Ariana Grande performed at the city's concert hall. Here's what we know so far:
The fatalities include children. Police say the assault at an Ariana Grande concert in the English city was carried out by a single suicide bomber, whose name they believe they know. Daesh claimed responsibility.
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