At least 60 people have been killed as southern Brazil endures its worst flooding in more than 80 years. Rescuers are battling torrential rains as they search for missing people in the state of Rio Grande do Sul.

Panama's former security minister Jose Raul Mulino on Sunday stormed to victory in a presidential poll dominated by his old boss, the popular ex-leader Ricardo Martinelli, who buttressed his campaign despite being holed up in Nicaragua's embassy.

Researchers used a CRISPR-Cas9 tool to restore vision in adults and children with congenital blindness.