rtokens: " They could cause serious damage as much as 500 meters ( yards ) away from wherever they were detonated , " the spokesman added .
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tokens: " These are powerful weapons , " a spokesman with the Municipal Police told Reuters by telephone , adding that police had not ruled out a possible terrorist attack on the ornate Casa de Narino presidential palace in Bogota 's historic downtown area .
ltokens: Eight claymore mines fitted with powerful C-4 plastic explosives were found stashed in a real estate office on Friday located about two blocks from Colombia 's presidential palace , police said .