Taleban kidnappers have executed a second South Korean hostage, drawing harsh condemnation from Seoul. The militants also set a new deadline for negotiations to save the remaining 21 abductees, who were seized in Afghanistan more than a week ago. VOA's Kurt Achin reports from the South Korean capital.

Body of hostage Shim Sung-min, 29, is loaded into police vehicle, 31 Jul 2007

South Korea's Foreign Ministry confirms that the insurgents shot and killed 29-year-old Shim Sung-min.

Foreign Ministry Spokesman Cho Hee-yung says South Korea cannot hide its anger against the Taleban for this "merciless killing."

Shim was among 23 South Korean Christian activists abducted by Taleban militants in Afghanistan more than a week ago. His death follows the militants' execution Thursday of the group's 42-year-old pastor.

Even as the South Korean authorities were confirming Shim's death, the insurgents announced a new deadline of mid-day Wednesday Afghan time for meeting their demands.

The captors want the Afghan government to free a number of fellow insurgents being held in Afghan prisons in exchange for the hostages.

South Korea has sent a senior envoy to Kabul to work with Afghan President Hamid Karzai on the crisis. But South Korean presidential spokesman Chun Ho-seon says Seoul can only do so much.

Chun says South Korea has limited influence on the Afghan government, which so far refuses to free any Taleban prisoners. He calls on the Taleban to stop asking South Korea for things it is unable to deliver.

Chun says South Korean President Roh Moo-hyun is still firmly opposed to military action to free the hostages - but he adds that South Korea's patience is not endless.

Chun says if the Taleban kill more Korean civilians, South Korea will not just sit idle and watch. He does not say what other action the Roh administration might take.

Families of the hostages read their own statement on live television Tuesday, calling for U.S. help in the situation.

Kim Kyung-ja, mother of one of the surviving hostages, asks the United States to consider the hostage issue from a humanitarian, rather than a political, perspective.

The U.S. leads multinational security and stabilization efforts in Afghanistan, which South Korea supports with several hundred non-combat personnel. Some South Koreans have criticized Washington for refusing to use its influence to persuade Kabul to meet the captors' demands.

Washington generally refuses to negotiate, however, with those it considers terrorists - including the Taleban, which sheltered leaders of the al-Qaida terrorist network as they planned the September 11, 2001 attacks on New York and Washington.

Five Taleban prisoners were freed by the Afghan government in March in a deal that saved the life of an Italian journalist kidnapped by the Taleban. The release was widely condemned, by U.S. officials among others, and President Karzai said it would not be repeated.