Hiroshima and Nagasaki would be good candidates to cohost the 2020 Summer Olympics, outspoken Tokyo Gov. Shintaro Ishihara said Wednesday.

"For world peace, to have the Olympics in Hiroshima and Nagasaki, the only cities in the world subjected to nuclear bomb attacks, means a lot," Ishihara told reporters.

"I'm ready to give them as much advice as I can. I know it's difficult to attract the Olympics unless the entire nation works together."