South Korea's Joint Chiefs of Staff say they have confirmed that North Korea sent more balloons carrying trash to the South on Sunday morning.

They say the North apparently sent more than 1,100 balloons over five consecutive days since Wednesday.

About 400 of the balloons came down on South Korean soil.

The bundles contain scrap paper and plastic bottles, and pose no risk to human health.

North Korea first started sending trash balloons to the South in May in retaliation for southern activists sending balloons across carrying leaflets criticizing the North.

The North then stopped sending over trash balloons for nearly a month from early August.

South Korea's Yonhap News Agency quoted the country's Unification Ministry as saying voluntary action by civilian activists to disperse information into the North can never be used as a pretext for provocation against the South.

South Korea's Joint Chiefs of Staff are warning the public to be careful of falling objects, and to refrain from touching them.