rtokens: They are using tanks .
pos: " NNP ( NNP NNP NNP ) VBZ VBG TO VB DT NN .
tokens: " KDP ( Kurdistan Democratic Party ) is trying to overtake the city .
ltokens: United Nations relief officials said on Saturday the fighting in Arbil in northern Iraq was between rival Kurdish factions and they were not aware of any Iraqi military advance on the city .