Police officers in Berlin have found 3 homemade pipe bombs on the sidelines of a massive leftist May Day march. The devices, according to police spokesman Stefan Redlich, were packed with explosives, but weren’t detonated. However, they carried the explosive potential to cause very serious or even fatal injuries to anyone caught within the blast radius. Police had no immediate information on who left the bombs or what their motive may have been. Berlin traditionally sees huge protest rallies on May Day and clashes with police are frequent.