A second note, I know of several places in several of these plants 9I worked contract maintenance for 5 years for Brown and Root) that where a seemingly small act of sabotage would create a huge explosion. There are literally tonnes of volatile chemicals in them.
I live in Jones Creek, about 5 miles away. This is not BASF's manufacturing site, but rather a storage terminal located at the Port of Freeport. BASF has large anyhdrous ammonia storage tanks sited there. Prevailing south/southeast winds would carry fumes over Freeport, west winds towards Surfside toward Galveston.
Like you say, a little explosion could cause a big problem.