More than 50 police officers have been hurt and 10 people arrested as a result of rioting over the past 10 days, in several towns and cities across Northern Ireland. The UK and Irish prime ministers have condemned the violence, and Northern Ireland's government met on Thursday to call for an "immediate and complete end" to the unrest. All Northern Ireland's main parties have condemned the rioting, although they are divided over its causes. Where has the violence been happening? Violence involving gangs of people as young as 12 started on 29 March in an area of Londonderry that is loyalist - in favour of keeping Northern Ireland as part of the United Kingdom. Since then, there have been protests and rioting on a near-nightly basis in a number of towns and cities, including Belfast, Carrickfergus, Ballymena and Newtownabbey. The rioting has largely seen loyalist youths throwing bricks, fireworks and petrol bombs at lines of police officers and vehicles. But on Wednesday night the fighting escalated into sectarian clashes over a so-called peace wall in west Belfast that divides predominantly Protestant loyalist communities from predominantly Catholic nationalist communities who want to see a united Ireland. A gate that divides the two was smashed open and, during several hours of disorder police officers and a press photographer were attacked and a bus was hijacked and burned. Parts of Northern Ireland are split along sectarian lines, 23 years after a peace deal largely ended Northern Ireland's Troubles - which lasted almost 30 years and cost the lives of more than 3,500 people.