The two brothers named by French authorities as chief suspects in the attack on the magazine in Paris were on the U.S. no-fly list, a senior U.S. counterterrorism official said Thursday.
Another U.S. official said Said Kouachi, 34, has traveled to Yemen. It was unclear whether Kouachi, 34, was there to work with extremist groups like Al-Qaida in the Arabian Peninsula, which is based there.
U.S. officials were tight-lipped about what else they know about Kouachi and his brother Chérif, 32, including whether they fought in the Middle East with terrorist groups.
Witnesses said the attackers claimed allegiance to al-Qaida in Yemen.
It would not be unusual for such people to be placed on the no-fly list, particularly since Chérif Kouachi had served 18 months in prison for recruiting people to fight the U.S. in Iraq.