VIENNA (Reuters) - The U.N. nuclear supervisor flew to Tehran on Sunday voicing optimism he could reach a deal to investigate suspected atom bomb research - a possible breakthrough that Iran may hope could help ease Western sanctions pressure and deflect threats of war. "I really think this is the right time to reach agreement. Nothing is certain but I stay positive," Yukiya Amano, director general of the International Atomic Energy Agency, said at Vienna airport, adding "good progress" had already been made. ...

A Wisconsin marathon was halted Sunday after several runners and walkers experienced heat-related problems and required medical attention.

Pakistan restored access to Twitter on Sunday, just hours after blocking the site over posts related to a contest involving caricatures of the Prophet Mohammed, the telecoms authority said.

Azahara Munoz of Spain defeated Morgan Pressel 2 and 1 in the semifinals of the Sybase Match Play Championship Sunday after a slow-play penalty against the American on the 12th hole turned the match, casting a shadow on the $1.5 million event.