U.S. troops remaining in Afghanistan, previously limited to counterterrorism against al Qaeda, can target Taliban fighters if threatened
Grand jury decision expected soon on whether to indict officer involved in shooting death of Michael Brown
Bob Simon returns to the site of the world's worst nuclear power plant disaster and it's still radioactive and dangerous -- almost 30 years later
Watch CBS News anytime, anywhere with the new 24/7 digital news network. Stream CBSN live or on demand for FREE on your TV, computer, tablet, or smartphone.