"An independent investigation with international experts is the best guarantee that victims of the explosion will get the justice they deserve," the watchdog said.
In France, prosecutors on Wednesday opened a probe into the blast over injuries inflicted on 24 French citizens.
Flights carrying medical aid, field hospitals, rescue experts and tracking dogs have been flying into Beirut airport since Wednesday.
And French President Emmanuel Macron was expected in Lebanon later Thursday, the highest-ranking foreign leader to visit since the tragedy.
Macron was due to meet Aoun and other political leaders as well as civil society representatives.
(Writers & Editors: PID/MLR/SPM, Agence France-Presse)
Source: http://u.afp.com/3Buj
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