"A man convicted of an attempted bomb attack in New York's Times Square said he planned to detonate a second bomb two weeks later, prosecutors say. Faisal Shahzad also said he thought the first bomb, which failed to go off, would kill at least 40 people, prosecutors say in new court documents. They argue Shahzad, a Pakistani-born US citizen, should be given a life term when he is sentenced, due on 5 October. Shahzad pleaded guilty in June to 10 weapons and terrorism charges. In the court documents, prosecutors say Shahzad left the US in 2009 to learn how to build bombs and attack targets in the US. ""I have been trying to join my brothers in jihad since 9/11 happened. I am planning to wage an attack inside America,"" Shahzad said in a 40-minute video released by prosecutors on Wednesday."