A South Korean activist said hundreds of thousands of leaflets had been launched by balloon across the border with North Korea, after the North repeatedly warned it would retaliate against such actions.
The move is certain to intensify tensions between the Koreas, after the North abruptly raised its rhetoric against South Korean civilian leafleting and pushed to resume its psychological warfare against the South.
Police in the South Korean border town of Paju said today that they were checking into details about the reported leafleting.
Activist Park Sang Hak said his organisation flew huge balloons carrying 500,000 leaflets, 2000 one-dollar notes and small books on North Korea from Paju overnight.
Park, formerly a North Korean who fled to South Korea, said in a statement his leafleting is "a struggle for justice for the sake of liberation of" North Korean residents.