President Barack Obama and leaders of other major industrial powers grappled Friday with options to solidify world resolve against development of an Iranian nuclear bomb and encourage a more forceful response to worsening violence in Syria.

VIENNA (Reuters) - Iran and the U.N. nuclear watchdog are making headway towards a framework deal on how to tackle concerns about its atomic activity, diplomats say, a potential bargaining chip for Tehran in next week's negotiations with world powers. Iran says such an agreement is needed before it can consider a request by U.N. inspectors to visit the Parchin military site where they believe explosives tests relevant for developing nuclear weapons may have been carried out. ...