Officers removed sound equipment, bottles were thrown and police drew their batons in confrontations with protesters. Speakers at the rally denied they were conspiracy theorists, arguing they were standing up for freedom of expression and human rights. Several people were seen being led away in handcuffs. After much shoving between them, another police officer steps in and shoves her to the ground, prompting even greater recriminations from her fellow protesters. The woman and police then grapple with what appears to be walking stick as onlookers shouted in her defence.
they were protesting police HQ results.
( z0 protest :ARG0 ( z1 they ) :ARG1 ( z2 thing :ARG2-of ( z3 result :location ( z4 headquarters :poss ( z5 police ) ) ) ) )
(z0 / protest-01
    :ARG0 (z1 / they)
    :ARG1 (z2 / thing
              :ARG2-of (z3 / result-01
                           :location (z4 / headquarters
                                         :poss (z5 / police)))))
they were protesting police HQ results .
z0 :ARG0 z1
z4 :poss z5
z0 :ARG1 z2
z2 :ARG2-of z3
z3 :location z4