South Korean President Lee Myung-bak has vowed to respond "resolutely" to the sinking of a warship last month near the sea border with the North.
The North has denied causing the explosion near the disputed border which sank with the loss of 40 sailors.
In an emotional speech, the president wiped away tears as he recited the names of the dead and missing sailors.
WHAT WILL OBAMA DO!?
PROBABLY SEND CARTER, BJ CLINTON AND MADELINE ALLBRIGHT TO NORTH KOREA WITH GIFTS AND TO OFFER AN APOLOGY FOR LEE MYUNG-BAK'S OVERLY PASSIONATE AND THOUGHTLESSLY AGGRESSIVE WORDS.