Police sealed off the intended launch site early on Monday.
The site would remained sealed off until the activists ''give up their plan'', an unnamed police official told AFP news agency.
"It's for security reasons ... The activists have been blocked from entering the site and will not be able to launch balloons from the park," the official was quoted as saying.
So now North Korea thinks they can push South Korea around. Don't be surprised if North Korea's leaders don't believe South Korea will respond forcefully if North Korea launches another attack on South Korea that kills South Korean military personnel.
UPDATE: Lift off:
South Korean activists floated balloons carrying tens of thousands of anti-Pyongyang leaflets into North Korea on Monday, eluding police who had disrupted an earlier launch attempt due to threats from North Korea.
Now let's see if North Korea wants to test South Korean resolve to respond to North Korean violence.
