But the three European countries have uncovered evidence that Iran is doing maintenance work on centrifuge piping at an enrichment plant at Natanz in southern Iran , according to a British official .
Iran /location/location/contains Natanz
Iran /location/location/contains Natanz
CC DT CD JJ NNS VBP VBN NN IN NNP VBZ VBG NN NN IN NN NN IN DT NN NN IN NNP IN JJ NNP , VBG TO DT JJ NN .
Iran
LOCATION
Natanz
LOCATION
/location/location/contains
Iran
LOCATION
Natanz
LOCATION
/location/location/contains