leaflet remove layergroup
// USE map.removeLayer( group );
var map = L.map('map').setView([44.646, 22.637], 12);
var layer = L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png').addTo(map);
var group = L.layerGroup().addTo(map); // <=== CREATE
var marker1 = L.marker([44.64, 22.63]).addTo(group);
var marker2 = L.marker([44.65, 22.63]).addTo(group);
map.on('click', function() {
map.removeLayer( group ); // <=== REMOVE
});