NEW : U.K. minister calls on M23 to `` stop its advance and to withdraw from Goma immediately '' Uganda 's president summoned M23 's political leader to Kampala for discussions . Fierce fighting erupted Thursday in Sake , a city west of Goma . Bandoliers rattled around their necks as they carried PKM machine guns and Kalashnikov rifles , and some carried rocket-propelled grenades . '' The rebels have been holed up there since last week when they seized control of the town after an offensive by government troops.
NEW : U.K. minister calls on M23 to `` stop its advance and to withdraw from Goma immediately '' Uganda 's president summoned M23 's political leader to Kampala for discussions . Fierce fighting erupted Thursday in Sake , a city west of Goma . The rebels have been holed up there since last week when they seized control of the town after an offensive by government troops.