Paraguayan Interior Minister Francisco De Vargas reported the first five deaths from the Saturday attack in Arroyito, a town about 305 miles from Asuncion.
Bernardo Jacquet, a physician at Hospital Concepcion, located some 90 kilometer from where the attack occurred, later said that the death toll had risen to eight.
Authorities suspect the attack was carried out by a little-known Paraguayan guerrilla group called the Paraguayan People's Army.
A cease-fire in the Colombian conflict that lasted more than a half-century will take effect at midnight next Monday.
The Paraguayan government considers members of the Paraguayan People's Army to be terrorists under an anti-terrorism law.
The Paraguayan People's Army was blamed last year in the killing of a German couple. Their bodies were found after the rebels abducted the pair from their cattle farm and demanded that the owner of a farm pay USD 300,000 and give food to the poor.
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