BRUSSELS, March 21 (Xinhua) -- European Union's (EU) 27 members unanimously agreed to Art. 50 extension until May 22 if Withdrawal Agreement is approved next week by Britain's House of Commons, President of the European Council Donald Tusk said on Twitter Thursday.

If the Withdrawal Agreement is not approved next week, then extension will go to April 12, said Tusk.

The EU 27 also approved the Strasbourg Agreement on Thursday and will continue no-deal preparations, said Tusk.