The Brazilian Air Force found the bomb, which they said was comparable to dynamite with a fuse, during a routine security sweep prior to the pope’s arrival. It was detonated without incident.
“It was a homemade device with little potential to cause fatalities,” the military said in a statement. “It is worth pointing out that such episodes formed part of our security forces’ training in Aparecida and at no point were civilians' lives in danger.”
http://rt.com/news/bomb-found-brazil-pope-visit-441/