Should Bob Vylan be prosecuted? The British prime minister has condemned the punk rock duo after they led chants at Glastonbury. Some are now calling for arrests; others bitterly disagree.
Furious row over anti-Israel chants
Controversial: Bob Vylan's frontman Bobby Vylan stood by his words at Glastonbury, posting online: "I said what I said." Glossary
JS Mill - John Stuart Mill (1806 - 1873) was an English thinker known for his liberalism.
Bob Vylan - An English punk duo. The pair perform under the stage names Bobby Vylan and Bobbie Vylan to maintain privacy.
Glastonbury - An English town known worldwide today for its yearly music festival.
IDF - Israel Defence Forces, Israel's national military.
Nuremberg Rally - Annual Nazi rallies held in the 1930s in Germany.
anti-semitism - Showing hatred or prejudice towards Jewish people.
Mandatory - Compulsory.
Collective punishment - The punishment of a group for crimes committed by individuals is forbidden under international law.
White phosphorus - A chemical substance which is harmful to humans and can cause deep burns.
Human shields - A method of warfare in which civilians are placed near military sites to prevent attacks from the other side. Often the civilians are not given the choice of whether or not to be placed in danger.
Genocide - The annihilation of a people, either through killing of its members, or through the suppression of its culture.
Apartheid - A system of legally-enshrined racial discrimination and oppression which existed in South Africa from 1948 until the 1990s. It denied non-white South Africans basic human rights.