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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 .
 location contains: Iraq, Samarra
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  Iraq, Samarra 
Answer:
 location contains: Iraq, Samarra