A scuffle broke out between troops of India and China near Naku La in the Sikkim sector along the Sino-Indo border on May 9 , sources said. Several soldiers sustained injuries in the clash. The troops disengaged after dialogue at the local level, they said. "Troops resolve such issues mutually as per established protocols. Such an incident occurred after a long time," said a source. These are rare incidents but it is a cause of worry. severa soldiers of both sides were injured in the clash.