And the statistical probabilities of these events occurring so closely together is......?
Well I looked up refinery explosions, before this year, there were 10 incidents in 29 years.
There have been 3 in April this year. Seems significant to me.
http://www.google.com/search?q=history+of+refinery+explosions&hl=en&sa=X&tbo=p&tbs=tl:1,tl_num:50&ei=vc_aS5erOsT48Aa6w7lr&oi=timeline_navigation_bar&ct=timeline-navbar&cd=2&ved=0CJ8BEMsBKAM