Amateur hour in the bomb factory?
Somebody sold them a defective timer?
Didn’t the Black Panthers blow themselves up 30 or 40 years ago in Philadelphia?
No...it was the cops.
"MOVE or the MOVE Organization is a Philadelphia-based black liberation group founded by John Africa. MOVE was described by CNN as "a loose-knit, mostly black group whose members all adopted the surname Africa, advocated a 'back-to-nature' lifestyle and preached against technology".[1] In addition, MOVE members were vegans and passionate supporters of animal rights. The group lived communally and frequently engaged in public demonstrations related to issues they deemed important."
"In 1985 the group made national news when police dropped a bomb on the Osage house from a helicopter in an attempt to end an armed impasse. The explosion and ensuing fire killed 11 people, including five children and the group's leader, John Africa. Only two occupants survived—Ramona, an adult and Birdie, a child. In addition, approximately 60 other (non MOVE-affiliated) homes were destroyed as the entire block burned."
In March 6, 1970, during preparations for the bombing of a Non-Commissioned Officers’ (NCO) dance at the Fort Dix U.S. Army base and for Butler Library at Columbia University, there was an explosion in a Greenwich Village house when the nail bomb being constructed prematurely detonated for unknown reasons. Weather Underground members Diana Oughton, Ted Gold, and Terry Robbins died in the explosion. Cathy Wilkerson and Kathy Boudin escaped unharmed. The Weather Underground was led by Bill Ayers, Bernardine Dohrn, Jeff Jones, and Celia Sojourn.
Are you thinking about the MOVE standoff/shootout in Philly in 1985?
http://philadelphianeighborhoods.com/2010/06/28/west-philadelphia-25-years-later-move-on-the-move/