SAN'A, Yemen (AP) – Yemen's government said Tuesday the U.S. should have shared its warnings about the Nigerian suspect, Umar Faruk Abdulmutallab, in the botched Christmas Day airline attack, and said it was tightening restrictions on student visas like the one that allowed the young man to enter the country.

Information Minister Hassan al-Lozy confirmed that Abdulmutallab spent two extended periods in Yemen, as recently as this month, and that authorities were trying to determine what he did during that time.
U.S. authorities have been trying to determine how Abdulmutallab, 23, managed to board a flight from Amsterdam to Detroit with explosives even though he was flagged on a watch list as a possible terrorist. U.S. officials have said he told investigators after his arrest that he received training in Yemen.
Meanwhile, a group calling itself al-Qaeda posted a statement on the internet on Monday claiming responsibility for the failed attempt.
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