An activist group has said France's first air strike on Islamic State (IS) militants in Syrian territory killed 30, including 12 child soldiers.
The UK-based Syrian Observatory for Human Rights said Sunday's strike on an IS camp in eastern Syria had also wounded about 20 fighters.
French President Francois Hollande said on Sunday six jets had destroyed the camp in the province of Deir al-Zour.
France had previously limited its strikes on IS to Iraqi airspace.
French Defence Minister Jean-Yves Le Drian said the raid had struck "an extremely sensitive site for [IS]", describing it as a "strategic hub" for militants travelling between Iraq and Syria.