Metropolitan police personnel specializing in explosives defused the rockets. Some 100 people were working inside the plant.
The rockets blew up before police explosives experts could arrive.
( z1 blow-up :ARG1 ( z2 rocket ) :time ( z3 before :op ( z4 possible :ARG1 ( z5 arrive :ARG1 ( z6 person :ARG0-of ( z7 have-org-role :ARG1 ( z8 police ) :ARG2 ( z9 person :ARG1-of ( z10 expert :ARG2 ( z11 explosive ) ) ) ) ) ) ) ) )