World news from the BBC

The British Prime Minister David Cameron has urged the Sri Lankan President Mahinda Rajapaksa to protect the rights of its minority Tamil community. The two leaders met during the commonwealth Summit in Colombo. Mr. Cameron's office said the Prime Minister has robust exchange views with Mr. Rajapaksa about Sri Lanka's human rights record.

More than 100 UN member states have agreed to open formal discussions next year on controlling lethal autonomous weapons or killer robots. The United States, Russia and China are thought to be among those countries now developing the technology for use on the battle field. Human rights groups say this only a start, they are calling for a complete ban. From Geneva Imogen Foulkes.

The UN process to limits some conventional weapons does not have a record of acting swiftly. Such slow progress was made over banning landmines that eventually some countries negotiated a separate agreement outside the UN system. It became the auto a man banned treaty. The same happened with class exterminations, a separate convention was agreed in Oslo. But some of the World's biggest military powers, the United States, Russia and China have signed neither.

The United Nations Security Council has rejected an African bid to postpone the trial at the International Criminal Court of the Kenyan President Uhuru Kenyatta and his deputy William Ruto. They have been charged with committing crimes against humanity during post-election violence in 2008. The African Union wanted to delay the trial by a year said the two men could deal with the aftermath of the attack on the Westgate mall in Nairobi in September.