UN calls for investigation into attack on Yemen envoy's convoy

INTRO:
The United Nations is calling for an investigation in Yemen on what
has been called a "grave" attack on a convoy carrying a UN envoy.

In a statement, the UN said Yemen had a responsibility to protect its
personnel and ensure their safety.

Our UN correspondent Laura Cantekin reports.

IN: "Following talks..."
OUT: SOC
DUR: 34

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