An officer at the scene told The Associated Press that police found no signs of the threatened bomb. ;This was a routine precaution. Terrorist groups which have threatened it in recent years include Al-Qaeda and Isis. This article is more than 2 years old. The official was not authorized to be publicly named.
also, an official at the scene, who was authorized to anonymously cite sources over police, said  that police found some clear evidence of the bombing.
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    :ARG0 (z1 / official
              :ARG2-of (z2 / authorize-01
                           :ARG1 (z3 / cite-01
                                     :ARG0 z1
                                     :ARG1 (z4 / source
                                               :ARG1-of (z5 / instead-of-91
                                                            :ARG2 (z6 / police)))
                                     :mod (z7 / anonymous)))
              :location (z8 / scene))
    :ARG1 (z9 / find-01
              :ARG0 z6
              :ARG1 (z10 / thing
                         :ARG0-of (z11 / evidence-01
                                       :quant (z12 / some)
                                       :ARG1 (z13 / bomb-01)
                                       :ARG1-of (z14 / clear-06))))
    :mod (z15 / also))
also , an official at the scene , who was authorized to anonymously cite sources over police , said that police found some clear evidence of the bombing .
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z1 :ARG2-of z2
z3 :mod z7
z2 :ARG1 z3
z3 :ARG0 z1
z3 :ARG1 z4
z4 :ARG1-of z5
z0 :ARG0 z1
z0 :mod z15
z5 :ARG2 z6
z9 :ARG0 z6
z0 :ARG1 z9
z9 :ARG1 z10
z10 :ARG0-of z11
z11 :ARG1-of z14
z11 :quant z12
z11 :ARG1 z13