JOHANNESBURG (AP) — South Africa closed its border with Mozambique shortly after opening it on Thursday as post-election violence in the neighboring country escalated, leading to clashes between protesters and the police.

Authorities also warned South Africans to postpone non-essential visits to Mozambique. Amnesty International said on Wednesday that at least 20 people have died and hundreds more have been injured and arrested since the beginning of the protests in late October.

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