Nicola Sturgeon: 'Brexit is a leap in the dark'

Nicola Sturgeon has said unanswered questions around the impact of Brexit mean the triggering of Article 50 is a "leap in the dark".

The delivery of a signed letter from Prime Minister Theresa May to European Council President Donald Tusk has begun the formal process of leaving the EU.

The first minister told BBC Scotland that consequences for the economy and society were yet to be seen.