Up to 150 workers were believed to have been inside the factory, which produces syringes and other plastic medical supplies, at the time of the explosion.
Up to a hundred workers were believed to have been inside.
( z1 believe :ARG1 ( z2 person :ARG0-of ( z3 work ) :quant ( z4 up-to :op 100 ) :location ( z5 inside ) ) )