"Alarms, wires, clocks and bangers" were uncovered during raids targeting 21 people suspected of "seriously trying to disrupt or prevent," the June 6 to 8 summit in the Baltic Sea resort of Heiligendamm, German weekly news magazine Focus reported.

In an issue due to appear o­n Monday, it said police found "non-conventional explosives" at a farm near Berlin. Fake identity cards were found at the home of another suspect in the northern city of Hamburg.