The South Korean president, Lee Myung-Bak, has addressed his nation for the first time, since neighbouring North Korea lobbed artillery fire last week, killing four South Koreans.

The South Korean president has warned North Korea it will "pay the price" for any further provocations.

North Korea has repeatedly promised that the attack might be just a taste of things to come if it's provoked further.

Tensions on the Korean peninsula have steadily grown in recent months, and things are heating up even more.

Al Jazeera's Azhar Sukri reports.