Pictures on social media appeared to show Abdullah al-Senussi stepping down from a helicopter
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Libyan ex-spy chief Abdullah al-Senussi held in Tripoli

5 September 2012 Last updated at 23:13 BST

Deposed Libyan leader Muammar Gaddafi's intelligence chief is being held in Tripoli after being deported from Mauritania.

Libya has promised a fair trial for Mr Senussi, accused of crimes allegedly committed during Col Gaddafi's rule.

Jeremy Bowen reports.