Deaths occurred when a small overcrowded boat carrying 112 people set out to cross the Channel and panic took hold.
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Government has already chartered planes for deportations to start as early as July, but legal headaches far from over.
Amid high unemployment and a housing crisis, many in Rwanda are apprehensive about the $272m migrant deal with the UK.
The controversial law is expected to come into force within days with the first deportation flights in weeks.