[cokernel]

I believe I found some references to an attempted bombing shortly after Rudolf Hess's death.

* "Hess Death Sparks Neo-nazi Activity", Jewish Telegraphic Agency, August 24, 1987. https://www.jta.org/1987/08/24/archive/hess-death-sparks-neo... . "In Frankfurt, police arrested two young neo-Nazis who placed a bomb which did not go off in the city's central railway station."

* _Right-Wing Terrorism in the 21st Century: The 'National Socialist Underground' and the History of Terror from the Far-Right in Germany_, Daniel Koehler, Routledge, 2016. https://books.google.com/books?id=1w8xDQAAQBAJ&pg=PT211 "On August 20, 1987, two neo-Nazis were arrested after they had placed materials for a combined explosive and arson device in a locker at Frankfurt Main central station."

The latter account is sourced from p. 125 of

* _Verfassungsschutz 1987_, Bonn: Bundesministerium des Innern, 1988.

I was not able to find volumes of _Verfassungsschutz_ as far back as 1987 online.