At least one man was killed and a police officer seriously wounded Sunday when police raided a mosque in Kenya and arrested more than 100 people, a local police chief said.

Police said they stormed the Masjid Musa mosque in the coastal city of Mombasa because young men were being radicalized there.

A Kenyan ex-journalist accused of witness intimidation by the International Criminal Court (ICC) has lost his bid to defy an arrest warrant issued for him, a judge ruled Friday.

The Hague-based ICC last year issued a warrant for the arrest of Walter Barasa for allegedly trying to bribe witnesses to drop their testimony in the crimes against humanity trial of Deputy President William Ruto.

South Sudan released seven of the 11 key leaders held after an alleged coup bid last month, Kenya's presidency said Wednesday as Nairobi accepted to host the group.

The seven men appeared in apparent good health at a press conference hosted by Kenyan President Uhuru Kenyatta in the capital Nairobi.

Warnings by Kenyan security forces of impending attack just days before Somalia's Shebab gunmen stormed a Nairobi mall killing at least 67 people last year were ignored, parliamentary investigations have found, according to reports.

"There was general information on the impending terror attack on all the malls and other strategic Western interests, especially in Nairobi," the parliamentary report read, quoted by Kenya's Sunday Nation newspaper.

The International Criminal Court on Thursday postponed the opening date of the crimes against humanity trial of Kenyan President Uhuru Kenyatta at the request of the prosecutors.

The Hague-based court's chief prosecutor Fatou Bensouda asked for a three-month postponement after saying last month she no longer had enough evidence to put Kenyatta on trial for crimes against humanity allegedly committed in the aftermath of the east African country's disputed elections in 2007-8.

Northern Kenya is at risk of drought if current weather trends continue, the Red Cross warned Wednesday of the harsh areas awash with guns where people depend on animals for their livelihoods.

"The short rains lasting October, November and December failed, and we have not had rain so far in January," Red Cross Secretary-General Abbas Gullet told Agence France Presse, noting rains are not now expected until April.

East African nations have approved a 5,500-strong military force for war-torn South Sudan to end weeks of bitter fighting that has devastated the young nation, Kenya's foreign minister said Wednesday.

Thousands have been killed and half a million civilians forced to flee the fighting between troops loyal to President Salva Kiir and rebels allied to his sacked deputy Riek Machar.

Four men on trial for allegedly supporting the attack on Kenya's Westgate mall toured the massacre site Tuesday where at least 67 people were killed.

The September attack was claimed by Somalia's al-Qaida-linked Shebab insurgents.

Kenyan police officers described in court Friday how they battled the gunmen who carried out last year's Westgate mall massacre, in the trial of four men accused of supporting the attack.

The attack, in which at least 67 people were killed, was claimed by Somalia's al-Qaida-linked Shebab insurgents.

A witness in the trial of four men accused of helping the gunmen behind Kenya's Westgate mall massacre described Thursday how an attacker shouted out his allegiance to Somalia's al-Qaida-linked Shebab.

"I saw two slim men in black head scarves and jungle green combat trousers, they had belts and ammunition," said Thomas Kamau Ndung'u, a hairdresser in the mall, who gave evidence on the second day of the trial.