A 53 nation nuclear security summit wrapped up in South Korea on Tuesday with a warning by US President Barack Obama that the threat of nuclear terrorism "remains".<br /><br />The two biggest nuclear headaches, Iran and North Korea, were not on the summit's agenda and neither country was invited. But leaders did make a vague call for vulnerable atomic material to be secured within four years.<br /><br />...<br />http://www.euronews.net/
