the details were added (the first version was posted at 12:57)
Dozens of people have been injured in a collision between two subway trains in the South Korean capital, reports say.
Local reports say the number of injured could be as high as 170, BBC reported.
One train ran into the back of another that had stopped between stations because of mechanical problems on one of Seoul's main subway lines, Yonhap news agency reports.
The accident comes as the nation continues to mourn the deaths of about 300 people in a ferry disaster.