 Bolivian television showed two tanks and a number of men in military uniforms outside the building. But troops and armored vehicles later began to pull back. Supporters of Arce flooded into the plaza outside soon afterward. I'm Hayevin Juana. China's space officials say they welcome researchers from around the world to study rock samples from the country's lunar probe brought back to Earth from the moon. But they add there are limits to cooperation specifically with the U.S. Breaking news and analysis. Townhall.com.