The main post links to reuters, but also here is the article from DPRK.

Press Statement by Vice-Minister of National Defence of DPRK

Pyongyang, June 2 (KCNA) -- Kim Kang Il, vice-minister of National Defence of the Democratic People's Republic of Korea, made public the following press statement on Sunday:

From the night of May 28 to the dawn of June 2, we scattered 15 tons of wastepaper, favorite toy of the human scum, over the border areas of the ROK and its capital region with more than 3 500 balloons of various sorts.

We made the ROK clans get enough experience of how much unpleasant they feel and how much effort is needed to remove the scattered wastepaper.

We are going to halt wastepaper scattering over the border temporarily as our action was a countermeasure from A to Z.

But, if the ROK clans resume anti-DPRK leaflet scattering, we will correspond to it by intensively scattering wastepaper and rubbish hundred times the amount of scattered leaflets and the number of cases, as we have already warned. -0-
www.kcna.kp (Juche113.6.2.)

source: http://kcna.kp/en/article/q/0a00edca9a7b40989409da886de4e63b.kcmsf