South Korea investigates computer 'attack'

South Korean officials are investigating a suspected cyber-attack that has paralysed computer networks at broadcasters and banks.

Broadcasters KBS, MBC and YTN told police their networks were halted around 14:00, Yonhap news agency said.

Two banks, Shinhan Bank and Nonghyup, said their networks were affected.

The cause of the problems remains unknown. Last week, North Korea accused the US and its allies of attacks on its internet servers.

Tension has been high on the Korean peninsula in recent weeks, following Pyongyang's 12 February nuclear test.