NEW : Minutes later , they were followed by a column of a dozen rebels , running on foot , their pick-up truck having broken down further up the road . Prime minister calls on M23 to ` ` stop its advance and to withdraw from Goma immediately '' Kenya 's president summoned M23 's political leader to Nairobi for talks . Fierce fighting continued Thursday in Sake , a city west of Goma . He warns of ` ` the humanitarian crisis reaching new heights ''
NEW : Prime minister calls on M23 to ` ` stop its advance and to withdraw from Goma immediately '' Kenya 's president summoned M23 's political leader to Nairobi for talks . Fierce fighting continued Thursday in Sake , a city west of Goma . He warns of ` ` the humanitarian crisis reaching new heights ''