Amine El Khalifi, a 29-year-old Moroccan, was arrested near the US Capitol today and charged with attempting to use a weapon of mass destruction. An illegal alien since 1999, he had been watched by the FBI for some time as he planned a suicide attack with undercover agents whom he thought were members of al Qaeda. In Detroit, underwear bomber Umar Farouk Abdulmutallab filed an appeal against the life sentence he was given yesterday.