WASHINGTON -- With the United States accelerating its withdrawal from Afghanistan after helping to establish a new unity government there, a congressionally created watchdog warned this week that despite the signs of progress, Afghanistan is more unstable than ever: Insurgent attacks are on the rise, funded by an under-investigated and thriving opium-based economy, and the competence of the Afghan security forces is in doubt. The latest report from the Special Inspector General for Afghanistan Reconstruction (SIGAR), released on Thursday, illustrates the precarious situation remaining in Afghanistan.