About: mass casualty incident

Premodifier: mass casualty
Head noun: incident

Same concepts
http://dbpedia.org/resource/Mass-casualty_incident

Broader concepts

label	provenance	confidence
major emergency	isap:183212504	0.653946
disaster	isap:58764529	0.296185

Narrower concepts

label	provenance	confidence
hazardous material	isap:59665093	0.766539
terrorist attack	isap:99304087	0.750943
oklahoma city bombing	isap:51841703	0.724422