SAMARRA, Iraq: Five years ago, a blast tore through Iraq’s golden-domed Shiite Askari shrine in the mainly Sunni city of Samarra, helping ignite two years of sectarian strife that drove Iraq to the brink of civil war.

Now the shrine is being rebuilt and Shiite authorities are buying up nearby estates from Sunni residents to expand the mosque, risking reopening old sectarian wounds just as the last U.S. troops ready to withdraw by December.

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