July 13 (Bloomberg) -- Bombings in Uganda by the Somali militia al-Shabaab that killed at least 74 people have raised U.S. government concerns about the group’s growing ties with al- Qaeda, an Obama administration official said today.

Al-Shabaab, which the U.S. has designated as a terrorist organization, claimed responsibility for the July 11 attacks in Uganda’s capital, Kampala. Al-Shabaab said it targeted Uganda because the nation contributed troops to an African Union-led peacekeeping f...