World leaders at the G8 summit in the United States have emphasised the need for jobs and growth in

reviving

the global economy and urged Greece to remain in the eurozone. A statement issued at Camp David said a strong and cohesive eurozone was important for global economic stability. Paul Adams is at the summit.

The statement issued after a morning of talks about Europe's economic difficulties urged Greece to stay in the eurozone. The leaders said their

imperative

was to promote growth and jobs. All necessary steps should be taken, they said, to

re-invigorate

economies and combat financial stresses. But in a nod to the differences that exist over how to tackle the crisis in the eurozone, they said they recognised that the right measures were not the same for everyone. The summit has now moved on to other issues, including food security, energy and climate, partnerships in North Africa and the Middle East, and the war in Afghanistan.

German police say 20,000 people opposed to eurozone austerity programmes have rallied in the financial capital Frankfurt. Protesters carried placards reading "The eurozone is in ruins". Several hundred demonstrators were detained in Frankfurt on Friday during

unauthorised

protests close to the headquarters of the European Central Bank.

The United States has welcomed the departure from China of the legal activist Chen Guangcheng after weeks of diplomatic disagreement. Mr Chen boarded a plane for New York with his wife and two children shortly after they were issued with passports by Chinese officials. They are due to arrive within the next few hours. Jonathan Blake reports from Washington.