Obama Welcomes Steps On Iran Nuclear Deal, But 'Work Is Not Yet Done'

U.S. President Barack Obama has welcomed a framework agreement on curbing Iran's nuclear program, saying that it addresses one of the greatest threats to world security. Speaking at the White House, Obama emphasized that the deal will impose strict limits on Iran and will be carefully enforced. But he noted that the negotiators still have work ahead of them before a final agreement is reached. (Reuters)