The bombings were the (very real) casus belli for USA's war with Al - Qaeda. (politics.stackexchange.com)
Renters insurance can and does cover damage from mold casused by a covered peril, as long as you made a good faith effort to keep it from getting worse. (effectivecoverage.com)
«We warn the herdsmen not to create an opportunity for a civil war because any further attack on Chief Olu Falae or his farm would be deemed as casus belli.» (nigeriapoliticsonline.com)