What is Unifil and why has Israel been firing on its positions in Lebanon?

As the Israeli military attacks United Nations peacekeepers, we look at the background to the violence

• Middle East crisis - live updates

Unifil, the United Nations peacekeeping mission in Lebanon, has accused the Israel Defense Forces (IDF) of deliberate and shocking violations in recent days. Several of its positions have come under fire, prompting interventions from the UN security council and the Italian prime minister, Giorgia Meloni, among others.