Chemical leak at Houston-area plant kills 2 workers and injures several others, prompting city-wide shelter-in-place CNN2 killed, at least 35 injured after chemical release reported at refinery in Deer Park, officials say ABC13 HoustonPemex Deer Park reports Hydrogen Sulfide release, 2 killed, dozens affected; Deer Park shelter in place lifted FOX 26 Houston2 dead after a hydrogen sulfide leak at a Houston-area Pemex facility NBC NewsOne dead after chemical release at PEMEX Deer Park facility KHOU.com