A powerful storm is heading away from Japan's capital, Tokyo, after killing at least three people in the south of the country, officials say.

Typhoon Man-yi was later downgraded to a tropical storm with winds of 83km/h (51mph) as it passed south of Tokyo.

Man-yi struck the southern islands of Kyushu and Shikoku on Saturday, killing three people and injuring about 70.

Man-yi - the strongest typhoon on record to hit Japan in July - has also caused widespread flooding.

The storm's victims were an 11-year-old boy and a man in his 70s who drowned in separate incidents in Kyushu's Kagoshima prefecture on Saturday.

On Sunday, rescuers found the body of a 79-year-old farmer who was swept into a river in the prefecture of Tokushima on Shikoku island.

At least one person is still missing, officials say.

More than 30,000 have been evacuated from homes along the path of the storm.

Train and air services have been disrupted and highways closed.

The name Man-yi was taken from a strait that now forms a reservoir in Hong Kong.