Birds spark South Korea alert over 'unidentified object' at demilitarised zone

South Korea's military has said it was a flock of birds that prompted it to alert journalists that it had detected an "unidentified object" flying near the border with North Korea.

The South's Joint Chiefs of Staff had said earlier that its radar found "the traces of flight by an unidentified object" over the central portion of the Demilitarised Zone that divides the two Koreas.