Pressure cooker bombs have been used in a number of attacks in the 21st century . Among them have been the 2006 Mumbai train bombings , 2010 Stockholm bombings ( failed to explode ) , the 2010 Times Square car bombing attempt ( failed to explode ) , the 2013 Boston Marathon bombing , and the 2017 Manchester Arena bombing . Pressure cooker bombs are relatively easy to construct . With the exception of the explosive charge itself , most of the materials required can be easily obtained . The bomb can be triggered using a simple electronic device such as a digital watch , garage door opener , cell phone , pager , kitchen timer , or alarm clock . The power of the explosion depends on the size of the pressure cooker and the amount and type of explosives used
Boston Marathon bombing
Boston Marathon bombing
Pressure cooker bomb