BBC News with Jonathan Wheatley

The man accused of killing 77 people in Norway last July has pleaded not guilty to acts of terror and mass murder at the opening day of his trial. Anders Behring Breivik admitted carrying out a bombing following a shooting rampage in and around the capital Oslo, but denied criminal responsibility. He said he was acting in self-defence. Steve Rosenberg was at the court.

As the trial began, Breivik announced he was refusing to recognise the court's authority. Then prosecutors read out the names of his victims with details of their horrific injuries. Breivik displayed no emotion. He stared down at a folder that contained a list of those he'd killed and maimed. It was only when the court was shown his YouTube video depicting him as a crusader against multiculturalism and Islam that Anders Behring Breivik appeared moved to tears.

The Spanish government has denounced what it called the "hostile" and "arbitrary" announcement by Argentina of plans to nationalise a Spanish-controlled oil company. The Argentine President Cristina Fernandez said she wanted her government to take a 51% stake in the company YPF, which had been privatised in the 1990s. Vladimir Hernandez in Buenos Aires has more details.

The announcement puts an end to weeks of speculation about whether the government would move to take back YPF. This uncertainty had been having a critical effect on the valuation of the Argentine oil company in the financial markets as its shares had lost at least 40% of its value since the start of the year. The Argentine President Cristina Fernandez de Kirchner said her government would now send a draft bill to congress to take over 51% of YPF, which in effect nationalises most of the shares owned by the Spanish company.