Russia has blamed terrorists for the sabotage , noting that underground Islamic groups that collaborate with separatists in Chechnya are known to operate in the region .
Chechnya /location/administrative_division/country Russia
Russia /location/country/administrative_divisions Chechnya
Russia /location/location/contains Chechnya
NNP VBZ VBN NNS IN DT NN , VBG IN JJ JJ NNS WDT VBP IN NNS IN NNP VBP VBN TO VB IN DT NN .
Chechnya
LOCATION
Russia
LOCATION
/location/administrative_division/country
Russia
LOCATION
Chechnya
LOCATION
/location/country/administrative_divisions
Russia
LOCATION
Chechnya
LOCATION
/location/location/contains