There have been protest rallies, candlelight vigils and sit-in demonstrations in parts of South Korea.
Protesters are showing their opposition to the government plan to send thousands of troops to Iraq. The opposition has intensified with the abduction of a South Korean in Iraq, who's been threatened with death unless the government keeps its troops at home.
At one of the protests in Seoul, there were placards reading, "Sending the troops kills, kills, kills."
Officials in South Korea say they will keep their commitment to send 3,000 troops to Iraq, the third-largest contingent after the U.S. and Britain.