"After nine months UK has delivered Brexit," tweets EU's Tusk

Britain's permanent representative to the European Union Tim Barrow delivers British Prime Minister Theresa May's Brexit letter in notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to EU Council President Donald Tusk in Brussels, Belgium March 29, 2017. REUTERS/Yves Herman

BRUSSELS (Reuters) - European Council President Donald Tusk confirmed on Twitter that he had received Britain’s Brexit notification letter on Wednesday, saying “After nine months the UK has delivered Brexit.”

He tweeted a photograph of himself receiving the small, business-style white document from the British ambassador to the EU, Tim Barrow. It contains a signed letter from British Prime Minister Theresa May. Its delivery starts a two-year countdown to withdrawal at midnight, at the end of March 29, 2019.

Reporting by Alastair Macdonald; @macdonaldrtr