The trial opened Wednesday of four men charged in connection with the massacre at Kenya's Westgate mall, an attack claimed by Somalia's Al-Qaida-linked Shebab insurgents.

The court heard testimony from a guard who was outside the upmarket mall when the gunmen launched their attack in September, killing at least 67 people.

Somalia, although the militants quickly denied the claim.

The Kenyan military said the Thursday evening raid targeted a Shebab camp in Garbarahey in Gedo region, situated around 600 kilometers (390 miles) northwest of the capital Mogadishu and near the border with Kenya and Ethiopia.

Staff in a Kenyan hospital were gripped by panic Thursday when a man who was pronounced dead after committing suicide woke up a day later.

"The victim was saved before be could be embalmed," explained the superintendent in charge of Naivasha district hospital, Dr. Joseph Mburu.

One person was wounded Saturday when an improvised bomb exploded in the Kenyan capital, police said, in a shop in Nairobi's mainly ethnic Somali district Eastleigh.

The attack is the latest of a series of bomb or grenade blasts in Kenya.

Ten people were wounded Thursday when attackers hurled a grenade into a restaurant in a popular coastal tourist resort town in Kenya, police said.

The attack, one of a series of bomb or grenade blasts in Kenya, is the latest to target areas popular with foreign visitors who are key to the economy.

A Muslim cleric was shot dead by unidentified gunmen on Wednesday night in Ukunda, one of Kenya's prime coastal tourist spots, a local police officer said.

"It doesn't appear to be a normal robbery," Jack Ekakoro, a local police commander said Thursday. "He appears to have been a target of the attackers."

A cargo train derailed in a sprawling Nairobi slum Sunday, injuring at least 10 people as it crashed into makeshift homes where people are feared still trapped, rescuers and residents said.

"In all, 10 people have been treated at Kenyatta National Hospital," a Red Cross emergency officer at the scene told Agence France Presse, adding that three had sustained only slight injuries and have been discharged.

Kenya said Saturday it will send troops to troubled South Sudan to evacuate some 1,600 citizens, with many trapped in the flashpoint rebel-held town of Bor.

President Uhuru Kenyatta has "ordered the KDF (Kenya Defense Force) to commence immediate evacuation of the 1,600 Kenyans stranded in South Sudan", presidential spokesman Manoah Esipisu said in a statement.

At least one person was killed and three others seriously wounded when twin explosions rocked the Kenyan town of Wajir near the Somalia border late Friday, police said on Saturday.

The blasts ripped through the town market shortly after 8:00 pm, a senior police officer told Agence France Presse on condition of anonymity. "It looks like these were improvised explosive devices," the officer said.

Attackers hurled a grenade Thursday at British tourists in Kenya but it failed to explode, police said, a rare attack specifically targeting foreign visitors who are key to the economy.

The tourists were attacked while traveling by road from the Indian Ocean coastal resort of Diani to Kenya's main port of Mombasa, a mainly Muslim region whose white-sand beaches are popular with tourist but which is also troubled by extremist groups and religious tensions.