Bomb blast on Colombia highway leaves at least 20 dead ahead of May elections

Dissident Farc faction blamed for attack on Pan-American Highway that also injured 36 people in south-western region

The death toll in a weekend highway bombing in Colombia has risen to 20, with another 36 people injured, amid a surge of violence ahead of presidential elections next month.

Buses and vans were left mangled in the blast on Saturday on the Pan-American Highway, in the restive south-western Cauca department.

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