Vietnam is accusing China of ramming and sinking one of its fishing boats in the South China Sea with 10 crew on board. China is returning the blame in kind, saying the boat capsized after “harassing and colliding” with a Chinese fishing boat. The incident apparently occurred in waters near an oil rig over which the two countries have been fighting. Tensions began heating up in early May, when China moved the rig into waters also claimed by Vietnam, close to the disputed Paracel Islands. China has refused to remove the rig, which has resulted in anti-China protests in Vietnam.