The eldest son of an accused al-Qaida financier was arrested in his family's apartment on a US warrant, weeks after returning to Canada from more than a year of detention in Pakistan, officials said Sunday. Abdullah Khadr, 24, faces extradition to the United States on charges of procuring weapons for the al-Qaida terror network for use against US forces, said the US Attorney's office in Boston, where the charges were filed. He faces a maximum of life imprisonment. He allegedly bought explosives, rocket propelled grenades, mortar rounds and other munitions for al-Qaida at the request of his father, Ahmed Said Khadr, an Egyptian-born Canadian who was killed in a 2003 battle with Pakistani forces. Khadr had been held in Pakistan since October 12, 2004, when Pakistani intelligence officers picked him up in a car in Islamabad. He returned to Canada several weeks ago. All three of Khadr's brothers have been detained at various times and linked to terrorism.