It's not clear what caused the blast on the pan-American highway in the Cauca district, one of the country's most violent regions.

目前还不清楚是什么原因导致考卡地区泛美高速公路发生爆炸，该地区也是暴力活动最多的地区之一。

The authorities blamed the attack in the southwestern state of Cauca on the Farc rebel group which is in the peace talk with the government.

当局指责西南考卡省的这场袭击案是Farc叛军组织所为，该组织目前在与政府进行和谈。