McClatchy has the story U.N. calculations of poison rockets’ paths implicate Syrian guard unit.
“If the U.N. inspectors correctly calculated the trajectories, it certainly seems to indicate that the chemically armed rockets were fired from government-controlled land,” said Peter Bouckaert, Human Rights Watch emergencies director and weapons expert. “It’s clear and convincing evidence.”
Austin Long, a security and weapons expert at Columbia University, said his back-of-an-envelope tabulations since the U.N. report came out indicated that the Republican Guard, which is thought to control the chemical stockpiles, very likely moved one rocket system to a secure location near the base and launched.
I have given you links to the biographies of the experts quoted in the article. Perhaps this will help you to figure out if these are trustworthy experts. In this house of cards it is hard to figure out whom to believe.