THOUSANDS joined anti-Rwanda protests in the east Congolese city of Goma on Monday, denouncing Rwanda's alleged support of M23 rebels as Kinshasa recalled its interim acting ambassador from Kigali in a further souring of relations. Rwanda denies Congo's long-standing accusations that it backs the M23, a Tutsi-led rebel group that has attacked Congolese forces near the Rwandan border since 2012. Tensions escalated this month after the group launched a new offensive in North Kivu province and captured the strategic town of Kiwanja on Saturday, prompting Congolese authorities to expel the Rwandan ambassador. Congo's foreign ministry went further on Monday, recalling the…