Investigators were puzzled, but their focus soon shifted to Mario Buda, a longtime activist and former associate of Sacco and Vanzetti. The stock market ascended, the sun shined and elaborate business lunches beckoned. Wall Street had to show that it was functioning.As the financiers regained their footing, the NYPD, the FBI and private detective firms such as Pinkerton and the William J. Burns International Detective Agency began investigations. At 11:45 on the morning of September 16, 1920, it was a glorious time to be on Wall Street. Financial District workers barely recalled a thing.
The bomber is believed to have been at a local police office during the events.
( z0 believe :ARG1 ( z1 be-located-at :ARG1 ( z2 person :ARG0-of ( z3 bomb ) ) :ARG2 ( z4 office :ARG1-of ( z5 local :ARG1 ( z6 police ) ) ) :time ( z7 event ) ) )
(z0 / believe-01
    :ARG1 (z1 / be-located-at-91
              :ARG1 (z2 / person
                        :ARG0-of (z3 / bomb-01))
              :ARG2 (z4 / office
                        :ARG1-of (z5 / local-02
                                     :ARG1 (z6 / police)))
              :time (z7 / event)))
The bomber is believed to have been at a local police office during the events .
z2 :ARG0-of z3
z0 :ARG1 z1
z1 :ARG1 z2
z5 :ARG1 z6
z4 :ARG1-of z5
z1 :ARG2 z4
z1 :time z7