President Barack Obama has spoken of his gratitude to rescuers who helped some of the thousands of people caught up in the deadly storm he described as "one of the most destructive tornadoes in history".
Several bomb blasts have killed at least 12 people, a day after more than 70 died in attacks on majority Shi'ites, stoking fears of all-out sectarian war with minority Sunnis.
Ten striking South African miners have been taken to hospital after being hit by rubber bullets, as labour strife swells in mines and factories ahead of mid-year pay negotiations.
A monstrous tornado at least a half a mile wide roared through the Oklahoma City suburbs, flattening neighbourhoods and destroying a school as children and teachers huddled against winds up to 200mph.
NO options are off the table if Syria's ruling regime refuses to seriously engage in an inter-national conference to broker peace in the country, Foreign Secretary William Hague has warned.