Iran to tackle economic issues, says further attacks will be 'more painful'

DUBAI, Sept 6 (Reuters) - Iran said it will step up efforts to tackle problems created by the U.S. sanctions that are crippling its economy, while a senior Iranian official warned of a "painful response" if it comes under further attack. Six months after U.S.-Israeli strikes against Iran, the war appears to be at a stalemate. A preliminary ceasefire accord reached in June has unravelled and little progress has been made in diplomatic efforts to get the peace process back on track.