South Korea prepares for bioattack

Tensions continued to mount Tuesday between North and South Korea when a nationwide civil defense drill was held in South Korea.

The defense drill was the first nationwide drill since 1989 aimed at handling possible chemical, biological and radiological attacks, officials with the National Emergency Management Agency told the Associated Press.

Both North and South Korea have exchanged hostile words since the recent sinking of a South Korean warship. However, Seoul officials told the AP they do not believe the renewed hostilities will lead to all-out war.

“Now, North Korea is maintaining a considerably strengthened vigilance posture and as you know it's been issuing many threats and statements through various channels,” South Korean Defense Minster Kim Tae-young told the National Assembly on Tuesday, the AP reports. “But there have been no serious military activities at the border and in rear areas.”

Meanwhile, the U.N. Security Council on Mondaythat it was “gravely concerned” about further hostilities and encouraged both sides not to engage in any hostile acts.

South Korea has taken punitive measures against North Korea, including trade restrictions, since the warship Cheonan was sunk in March, killing 46 sailors.

North Korea has denied sinking the warship and has warned that retaliation would trigger war, the AP reports.

“We are just a victim,” Pak Tok Hun, North Korea's deputy U.N. ambassador, told reporters “So we'd like to make our position clear.”

North and South Korea are still technically at war because the 1950-53 Korean War ended in an armistice, not a peace treaty, according to the AP report.