ANFO of Shijiazhuang, China, on 16 March 2001. A total of 108 people were killed, and 38 others injured when, within a short time, several ANFO bombs exploded near four apartment buildings. Improvised bombs made with agricultural-grade AN are less sensitive and less efficient than the explosive-grade variety. In November 2009, a ban on ammonium sulfate, ammonium nitrate, and calcium ammonium nitrate fertilizers was imposed in the former Malakand Division – comprising the Upper Dir, Lower Dir, Swat, Chitral and Malakand districts of the North West Frontier Province (NWFP) of Pakistan – by the NWFP government, following reports that those chemicals
Improvised firearm by a metal detector per federal law. Though California passed a law in 2016 that requires anyone planning to build a homemade gun to obtain a serial number from the state ("de facto" registration) and pass a background check. However, such firearms are often illegal in other jurisdictions such as Texas and are commonly associated with gangs, where they may be used to facilitate violent crime, such as homicide. In other cases, they may be used for other criminal activities not necessarily related to violent crime, such as illegal hunting of game. Improvised firearms are most commonly encountered in regions