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. 'A terrorising strike' In the video, the 30-year-old fires a machine gun and says he has met members of the Pakistani Taliban and has decided "to raise an attack inside America". The government said Shahzad had not shown any remorse when he pleaded guilty after confessing to the attempted bombing. Prosecutors wrote that the financial analyst "spoke with pride about what he and his co-conspirators had done". They argued Shahzad had "every intention of delivering a powerful and terrorising strike to the heart of New York City". Shahzad was arrested two days after the attempted 1 May bomb attack in busy Times Square, where the explosives he had packed into the back of a vehicle failed to detonate. Source: BBC