2008■ June 12: Umar Farouk Abdulmutallab applies for a visa at the US Embassy in London.
■ June 16: His visa is granted. The visa is a regular multiple-entry tourist visa valid until June 12, 2010.
■ Aug. 1-17: Abdulmutallab visits Houston.
2009■ January: Abdulmutallab attends the University of Wollongong in Dubai.
■ May: Britain refuses to grant Abdulmutallab a student visa because the school on his application form was not a government-approved institution.
■ August to early December: Abdulmutallab visits Yemen after receiving a visa to study Arabic in a school in Sana, according to the Yemeni Foreign Ministry.
■ Nov. 19: Abdulmutallab’s father goes to the US Embassy in Abuja, Nigeria, to express concern his son was in Yemen and had fallen under the influence of extremists.
■ Nov. 20: The US Embassy sends a so-called VISAS VIPER cable with the information that Abdulmutallab’s father had provided. The cable is sent to all US diplomatic missions and the State Department in Washington, where it was also shared with the interagency National Counterterrorism Center for review.
■ Nov. 20: Abdulmutallab’s name is entered into the National Counterterrorism Center’s Terrorist Identities Datamart Environment database based on information provided by his father.
■ Dec. 16: Abdulmutallab’s round-trip plane ticket is purchased in Accra, Ghana, for $2,831 in cash, presumably by Abdulmutallab himelf, according to Nigerian officials.
■ Dec. 24: Abdulmutallab reenters Nigeria for only one day to board a flight from Lagos to Detroit, via Amsterdam.
■ Dec. 25: Abdulmutallab allegedly tries to bring down
■ Dec. 27: Abdulmutallab is transferred to a federal prison in Michigan.