YEONPYEONG ISLAND, South Korea (AP) - The United States and South Korea are preparing for war games Sunday, while some South  Koreans are demanding vengeance for a deadly North Korean artillery barrage.
      
With fears of more clashes between the two Koreas growing, China has sent a pair of envoys to Seoul. The Yonhap news agency reports the senior officials met with the South Korea's foreign minister. It says they discussed Tuesday's attack and international talks on ending North Korea's nuclear programs.
     
At a funeral service today for two marines killed in the attack, South Korea's marine commander vowed to retaliate a "thousand-fold." That sentiment was cheered by some watching the funeral on a big screen at Seoul's main train station. One 19-year-old says "once the enemy attacks," it a "duty to respond even more strongly."
      
The government has been criticized for a weak response, prompting President Lee Myung-bak to replace his defense minister.
      
Meanwhile, North Korea is blaming Seoul for the two civilian deaths. It says South Korea used them as a "human shield" around artillery positions.
      
Pyongyang also claims that the United States orchestrated the clash so that it could stage naval exercises in the Yellow Sea.