East African leaders warned South Sudan's warring rivals Thursday they must "come to their senses" to end almost 11 months of bloodshed amid renewed threats of international sanctions.

"There appears to be little appetite for peace, while the people of South Sudan continue bearing the full brunt of conflict," Ethiopian Prime Minister Hailemariam Desalgen said at a summit of regional leaders pushing for a peace deal.

Gunmen in the Kenyan port city of Mombasa have shot dead a moderate Muslim cleric, a vocal opponent of the radical preaching of Somalia's al-Qaida-linked Shebab insurgents, police said Wednesday.

The shooting in Kenya's second city is the latest in a series of killings of preachers, amid power struggles between rival Muslim factions.

The U.N. refugee agency on Tuesday voiced alarm at violence raging in a sprawling complex of refugee camps in northwestern Kenya that has left eight dead in the past week.

Violence at the Kakuma camps sparked by reports of the attempted rape of a young refugee girl last Tuesday has claimed the lives of eight refugees from Burundi, Democratic Republic of Congo and South Sudan, UNHCR said.

The Kenyan army said it had repelled a machete attack on a military barracks in a tourist resort near Mombasa on Sunday, killing six assailants.

About a dozen youths tried to break into the barracks in the Indian Ocean town of Nyali at around 5:30 am (02:30 GMT), the army said in a statement.

Seven police officers were killed and 17 others were missing following an attack blamed on local tribesmen in Kenya's remote north, police sources said Saturday.

The officers, missing since Friday, are believed to have been ambushed during a security operation in the impoverished, arid region of Lake Turkana, the scene of regular raids and score-settlings between rival communities.

U.N. chief Ban Ki-moon will travel to Ethiopia, Djibouti and Kenya next week, leading a delegation from six other international organizations to the volatile Horn of Africa region.

The secretary-general will be joined by World Bank president Jim Yong Kim and by officials from the African Union, the European Union, the Intergovernmental Authority on Development (IGAD), the African Development Bank and the Islamic Development Bank, a U.N. statement said Friday.

East African leaders met South Sudan President Salva Kiir on Wednesday in the latest push to end over 10 months of a civil war that has devastated the young nation.

Ethiopian Prime Minister Hailemariam Desalegn, Kenyan President Uhuru Kenyatta and Ugandan Prime Minister Ruhakana Rugunda visited the war-torn nation's capital on a one-day visit to discuss the "on-going peace process", a spokesman in Kiir's office told AFP.

The leader of an outlawed secessionist group on Kenya's coast was arrested Wednesday along with a dozen supporters, a local government official said.

Mombasa Republican Council (MRC) chairman Omar Mwamnuadzi was arrested early Wednesday after police raided his house where he was meeting with a group of youths in Kwale, some 30 kilometers (20 miles) south of the main port city Mombasa.

President Uhuru Kenyatta arrived in Nairobi Thursday to crowds cheering him home, a day after becoming the first sitting president to appear before the International Criminal Court on crimes against humanity charges.

Kenyatta, who was given a red carpet welcome with a military honor guard as well as dancers singing songs declaring he "is innocent," had appeared in The Hague-based court on Wednesday.

Kenya's Uhuru Kenyatta on Wednesday became the first sitting president to appear before the International Criminal Court where he has been charged with crimes against humanity.

Kenyatta, who handed power to his deputy before flying to The Hague, was summoned to answer questions about his floundering trial for allegedly masterminding deadly post-election violence in 2007-2008.