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Since appearing on stage, flanked by masked gunmen and looking pale and thin, at a Hamas handover ceremony in Gaza City in February, US-Israeli hostage Keith Siegel has turned into an active campaigner.

He spoke to masked men selling drugs out in the open and carrying large weapons - they explained that teenagers as young as 13 had sometimes become involved in criminal activity in the favela.

More than 30 masked troops entered the embassy from the balcony and front and back doors, throwing grenades through the windows.

The healthcare boss was shot in the back by a masked assailant on 4 December as he was walking into a hotel where the company he led was holding an investors' meeting.

He recognizes their features and tattoos as those of the masked men who raided the resort.