The message was delivered over the phone in English , reports say . A spokesman for the group said it had been told by a source that the man who made the call to police is an Australian citizen and has lived there since he was 12 years old. The exercises come in the wake of a recent nuclear test in North Korea . South Korea 's military is already in a state of heightened alert .
The message was delivered over the phone in English , reports say . Such threat happen routinely before U.S.-South Korean exercises . The exercises come in the wake of a recent nuclear test in North Korea . South Korea 's military is already in a state of heightened alert .