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EU leaders to meet for special Brexit summit on April 29- EU's Tusk

BRUSSELS, March 21 (Reuters) - The European Union's 27 leaders will meet on April 29 to agree their negotiating lines for Brexit talks after London sends in a formal notification that it wants to leave the EU, the chairman of the summit Donald Tusk said on Tuesday.

The meeting is a necessary step before the negotiations between Britain and the 27 remaining EU states can start formally.

"I will call a European Council on Saturday, the 29th of April, to adopt the guidelines for the Brexit talks," Tusk told reporters.

(Reporting by Waverly Coleville; writing by Jan Strupczewski)