Is this terrorism? Days of riots led by far-right groups have targeted mosques and refugees. But there is little agreement on how we should describe the terrible violence.
Fear on the streets as UK riots grow
Crisis: The Prime Minister called an emergency meeting yesterday in response to a sixth day of escalating violence across Britain, following the fatal stabbing of three young girls in Southport last week. Glossary
Asylum seekers - People who have left their countries due to danger and are seeking refuge elsewhere.
Far-right - A range of ideologies that emphasise social order, racial purity and the elimination of opponents.
Nihilistic - Somebody who does not believe in anything, from religion to moral codes – or a belief that all of these things are bad and need to be destroyed.
Tsar - Title given to an emperor of Russia before the revolution of 1917. The word was originally used for the Bulgarian monarchs in the 10th Century, but can also be used to refer to anyone with absolute power.
Colonists - Members of a government-backed group who move to and settle in a new area. Colonists control the area politically.
IRA - The Irish Republican Army, or IRA, was an unofficial military organization made up of people who wanted an end to British rule in Northern Ireland.
Civilian - A person who is not in the armed services or the police force.
Islamist - An advocate of Islamic fundamentalism. Often used in the West to describe those who believe in imposing Sharia (Islamic law) on societies.
Middle East - The lands around the east of the Mediterranean Sea and Arabia.
Pogroms - Organised massacres of a particular ethnic groups, such as those of Jewish people in Russia and Eastern Europe in the late 19th and early 20th centuries.
Protestants - A group of Christians. Protestants separated from the Roman Catholic Church in the 16th Century. This took place at first in Germany.
Catholics - Followers of the Catholic church, a Christian denomination with over a billion followers worldwide, led by the Pope.
Liverpudlians - People from Liverpool, a city in northern England.