A final -- although less serious -- issue is that Iran conducted maintenance work on some valves involved in the enrichment program that were either broken or contaminated at the Natanz site .
Iran /location/location/contains Natanz
DT JJ : IN JJR JJ : NN VBZ IN NNP VBD NN NN IN DT NNS VBN IN DT NN NN WDT VBD DT VBN CC VBN IN DT NNP NN .
Iran
LOCATION
Natanz
LOCATION
/location/location/contains