North Korean drone reaches north of Seoul

South Korean military officials say North Korea has flown several drones across their mutual border.

The "unmanned aerial vehicles" violated South Korean airspace in the border areas around Gyeonggi province, said the country's joint chiefs of staff.

One of the drones flew to the north of the capital, Seoul.

The South Korean military said it had fired warning shots before sending up jets and helicopters to shoot them down.

However, the attempt to bring down the drones had failed so far and was continuing, it added.