Nearly 60 countries signed a treaty on Tuesday that bans governments from holding people in secret detention, but the United States and some of its key European allies were not among them.
The signing capped a quarter-century of efforts by families of people who have vanished at the hands of governments.
"Our American friends were naturally invited to this ceremony; unfortunately, they weren't able to join us," French Foreign Minister Philippe Douste-Blazy told reporters after 57 nations signed the treaty at his ministry in Paris.
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