Thousands of demonstrators marched in Frankfurt and Berlin on Sunday (April 2), expressing affection for a unified Europe. <br /> <br />Marching through the streets in Frankfurt and gathering in Berlin's historic Gendarmenmarkt public square, several held placards of 'The Pulse of Europe' movement - a grassroots initiative started in Frankfurt with the aim to keep Europe united. <br /> <br />"It is very important for me that Europe remains Europe, because Europe is a power for peace" said demonstrator Johann Hoika. <br /> <br />Demonstrators have been gathering for several non-partisan rallies on Sundays across German city in recent months, as angst has increased following Britain's decision to leave the bloc. <br /> <br />Prime Minister Theresa May triggered Britain's withdrawal from the European Union under Article 50 of the EU treaty on Wednesday (March 29). The country should be out in two years.