Venezuelan authorities have blocked two former Latin American presidents from visiting jailed opposition leader Leopoldo Lopez.

Andres Pastrana of Colombia and Sebastian Pinera of Chile traveled to Caracas this weekend to participate in a pro-democracy event organized by President Nicolas Maduro's opponents.

As part of their visit, the two conservative leaders on Sunday tried to visit Lopez in a military prison where he's been held the past 11 months, accused of instigating violence in anti-government protests last year.

After being informed by prison guards that their entrance wasn't authorized Pastrana said Lopez's basic human rights to receive visit from friends and family was being denied.

Maduro on Friday accused the former presidents of having "blood on their hands" for allegedly supporting extremist groups trying to oust him.

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