Washington D.C. --- At the request of President Obama, U.S. Energy Secretary Steven Chu has been helping oversee BP's "top kill" efforts from the BP Command Center in Houston. Below are two photographs from this week. Photo credit: Department of Energy.
U.S. Energy Secretary Steven Chu and National Laboratory scientists review options for the "top kill" attempt with BP officials.
U.S. Energy Secretary Steven Chu works on flow and resistance calculations as part of the "top kill" attempt.