The al-Qaida militants launched attacks against the Houthi group in Yemen's al-Bayda province on Tuesday, which killed at least 27 Houthi militants and wounded dozens of others.
An Al-Qaeda video claiming responsibility for last week's bloodshed at the French satirical newspaper was "authentic", but U.S. officials were cautious about holding the terrorist organization responsible for the attack, a State Department spokeswoman said Wednesday.
U.S. President Barack Obama on Saturday denounced the killing of an American hostage in a second failed rescue operation in Yemen, vowing to bring the killers to justice.
Al-Qaida affiliates launched a bombing attack on a bus near the air force base in Yemen's capital Sanaa on Sunday, killing at least 12 air force cadets aboard, officials and witnesses said.