No they can't. Chlorine gas is not explosive unless it is mixed with something like ammonia.
Chlorine is a poisonous, heavier than air, gas, and it will kill you, but it will not blow you up.
It will blow up if it is stored as a liquid. And those who use lots of it, store it as a liquid in cooled tanks. If those tanks hit higher temperatures they explode.
The disaster protocol requires that the tanks contents be slowly released out of doors and the immediate area as well as any low lying areas be evacuated until the gas has dissipated.