rtokens: The police spokeman said plastic explosive like C-4 is not a normal component in claymore mines .
pos: PRP VBD NNS VBN IN JJ NNS VBD VBG DT NN IN NN IN JJ JJ NNS CC JJ NNS .
tokens: He said police backed by explosive experts were combing the area in search of other possible weapons or explosive devices .
ltokens: " They could cause serious damage as much as 500 meters ( yards ) away from wherever they were detonated , " the spokesman added .