NEW : Kampala minister calls on M23 to `` stop its advance and to withdraw from U.K. Seeking refuge in the Mugunga IDP camp , already filled with 50,000 people . immediately '' Sake 's president summoned M23 's political leader to Goma for discussions . Fierce fighting erupted two days earlier in Sake , a city west of Goma . Oxfam warns of `` the humanitarian crisis reaching new depths ''
NEW : Kampala minister calls on M23 to `` stop its advance and to withdraw from U.K. immediately '' Sake 's president summoned M23 's political leader to Goma for discussions . Fierce fighting erupted two days earlier in Sake , a city west of Goma . Oxfam warns of `` the humanitarian crisis reaching new depths ''