Britain is investigating reports that cluster munitions have been used by a Saudi-led coalition in its on-going campaign against Houthi militants in Yemen, reports Reuters.

The British Foreign Secretary Philip Hammond announced the formal investigation in parliament on Tuesday after Amnesty international on Monday said that it had documented Saudi use of cluster bombs in Yemen that had been manufactured in Britain in the 1970s.

US President Barack Obama called on the Taliban to join the Afghan government “in a reconciliation process that leads to lasting peace and stability,” as he confirmed the death of leader Akhtar Mohammad Mansur in a drone strike on Saturday.

“Today marks an important milestone in our longstanding effort to bring peace and prosperity to Afghanistan,” said Mr Obama. “Mansur rejected efforts by the Afghan government to seriously engage in peace talks and end the violence that has taken the lives of countless innocent Afghan men, women and children.

“The Taliban should seize the opportunity to pursue the only real path for ending this long conflict - joining the Afghan government in a reconciliation process that leads to lasting peace and stability,” he added.

The strike, which took place inside Pakistan-controlled Balochistan, “sent a clear message to all those who target our people and our partners,” said the US president. “You will have no safe haven.”

Afghanistan's spy agency claimed that the leader of the Taliban Mullah Akhtar Mansour has been killed in a US drone strike in Baluchistan on Saturday.

Prosecutors in Rwanda called on governments across Europe to ensure genocide fugitives are prosecuted, following the successful conviction of a suspect for genocide in Sweden earlier this month.

Augustin Nkusi, spokesperson for the national prosecution body in Rwanda, praised the ruling but warned that genocide suspects still roam free across Europe.

“Twenty-two years down the road, it should be made clear to genocide suspects that they cannot escape justice forever,” he said. “We still have many genocide suspects in Europe roaming freely even with warrants for their arrest.”

US President Barack Obama on May 18 signed an executive order to detect and prevent mass atrocities.

Mr Obama said the prevention of atrocities is a "core national security interest of the United States."

However some human rights groups expressed disappointment at the limitations of the order.