President Obama and first lady Michelle Obama attend a memorial service at Baylor University in Waco, Texas, on Thursday, for those killed in the April 17 explosion of a fertilizer plant.
Jewel Samad/AFP/Getty Images
An undated screen image of footage shot by Al-Kataib Media, showing Denis Allex, a French hostage allegedly held by Somali militants, who was reportedly killed during the failed rescue mission.
President Obama shakes hands with with Afghan President Hamid Karzai during their meeting at the NATO Summit in Chicago on Sunday. The summit, which continues Monday, is focusing heavily on Afghanistan's future.
Pablo Martinez Monsivais/AP