May We Start Tip Toeing Toward A Conclusion

The Boston Marathon bomber(s) used pressure cooker bombs - a favorite of Islamic terrorists worldwide. 

The remains of what may have been a pressure cooker were found at the scene of one of the two explosions Monday at the Boston Marathon, according to the FBI.

Pressure cooker bombs have been used worldwide, with instructions readily available online and easily found through internet searches.

Instructions on how to make such a bomb were featured in the first issue of al-Qaeda's English-language magazine under the headline, "Make a bomb in the kitchen of your mom."