Because of an editing error , an article on Thursday about violence in Iraq misidentified the Shiite Muslim holy day that millions of pilgrims began celebrating in the holy cities of Najaf and Karbala , raising a security concern that caused the assigning of extra American troops to those cities .
Iraq /location/location/contains Najaf
Iraq /location/location/contains Karbala
IN IN DT NN NN , DT NN IN NNP IN NN IN NNP VBD DT NNP JJ JJ NN WDT NNS IN NNS VBD VBG IN DT JJ NNS IN NNP CC NNP , VBG DT NN NN WDT VBD DT NN IN JJ JJ NNS TO DT NNS .
Iraq
LOCATION
Najaf
LOCATION
/location/location/contains
Iraq
LOCATION
Karbala
LOCATION
/location/location/contains