A rocket was fired toward an airport used by American troops in eastern Afghanistan on Sunday, but it failed to explode, the Afghan military said as violence continued a week after the ratification of the first post-Taliban constitution. The rocket screeched over a village near Khost city airport at about 2 a.m., said Niishauddin, a spokesman for the military commander of Khost province. It failed to detonate, and investigators were not able to find the impact site, he said by satellite telephone from Khost city, 90 miles southeast of the capital, Kabul. Full Story