BOSTON (MyFoxBoston.com) -- Bomb experts who analyzed remnants of the Boston Marathon explosives believe the Tsarnaev brothers likely had more expertise than the surviving brother originally indicated.
Dzhokhar Tsarnaev told investigators that he and his 26-year-old brother, Tamerlan, used instructions from an al Qaeda magazine they found on the Internet to create the pressure cooker bombs that killed three and injured more than 280 others near the finish line of the April 16 marathon.
According to the Wall Street Journal, FBI experts claim the brothers deviated from the magazine's two bomb recipes. Among the main differences is the trigger. Investigators believe hobby fuses and a radio controller from a toy car to detonate the bombs.
Experts also believe the explosives were "consistent with commercial fireworks." Earlier in the week, investigators said Tamerlan Tsarnaev purchased nearly $200 worth of fireworks from a New Hampshire store. The experts warn that their analysis of the bombs are preliminary.