DUJIANGYAN, China - Chinese state media says troops are rushing to plug "extremely dangerous" cracks in a dam upriver from an earthquake-hit city. Xinhua News Agency said Wednesday that 2,000 troops had been sent to work on the Zipingku Dam, upriver from Dujiangyan in Sichuan province.

Dujiangyan saw buildings collapse and services cut off in Monday's magnitude 7.9 quake earthquake.