Colombia has detained four members of the Venezuelan national guard on Colombian soil amid continuing tension between the South American neighbours, BBC reported.
President Alvaro Uribe said they would be returned to Venezuela with the message that there was "unbreakable affection" between the two countries.
Venezuelan President Hugo Chavez last week sent troops to the border area.
Mr Chavez says a new US-Colombia military co-operation agreement sets the stage for an invasion of Venezuela.
Bogota and Washington dismiss the claims.
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