After a bomb exploded in Samarra at one of Iraq 's most sacred Shiite shrines on Wednesday , many young Shiites ignored his pleas for calm , instead heeding more extreme calls and attacking Sunni mosques and killing Sunni civilians , even imams , in a crisis that has threatened to provoke open civil war .
Iraq /location/location/contains Samarra
IN DT NN VBD IN NNP IN CD IN NNP POS JJS JJ JJ NNS IN NNP , JJ JJ NNPS VBD PRP$ NNS IN NN , RB VBG JJR JJ NNS CC VBG NNP NNS CC VBG NNP NNS , RB NNS , IN DT NN WDT VBZ VBN TO VB JJ JJ NN .
Iraq
LOCATION
Samarra
LOCATION
/location/location/contains