Kenya's army revealed Friday that the bodies of the gunmen who attacked Nairobi's Westgate shopping mall last year are in the hands of the FBI.

Military chief Julius Karangi was describing his troops' response to the attack at a forum organized by the media council to review coverage of the incident.

Four Somali men appeared in court Monday to face charges of an alleged attack on a cafe in Nairobi's airport, which police had initially dismissed as an exploding light bulb.

Anti-terrorism police officer Leonard Bwire said the four men were charged with having "planned and executed" a failed attack on the cafe at Jomo Kenyatta International Airport (JKIA) last month, the region's busiest transport hub.

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.

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.

Four people were killed in Nairobi Saturday when assailants threw a grenade on a bus, the Kenyan interior ministry said.

More than a dozen other people on the 32-seat bus were wounded, according to officials and the Kenyan Red Cross.

The four attackers responsible for killing at least 67 people at a Kenyan shopping mall may have escaped due to lax security, according to a New York police report released Tuesday.

The victims aged eight to 78, from 13 different countries, were killed at the Westgate mall in Nairobi during a terrifying assault claimed by Somalia's al-Qaida-linked Shebab terror group.

Mourners from Kenya's various colors and creeds gathered in the capital Nairobi Monday for an emotional ceremony marking one month since Islamist gunmen massacred close to 70 people in a mall.

Relatives of the victims of the four-day siege at the upmarket Westgate mall planted trees, lit candles and held prayers for the dead, with members of Kenya's black, white and Asian community putting on a display of unity.

 A Norwegian citizen of Somali origin is suspected of being one of the attackers who stormed a Kenyan shopping mall last month massacring 67 people, the BBC said.

The 23-year-old was named as Hassan Abdi Dhuhulow, who the BBC said is suspected of helping to plan and carry out the attack on the upmarket Westgate mall.

Kenyan police said Saturday that only between four and six armed men, not 10 to 15 as earlier thought, conducted the September attack on a Nairobi shopping mall that left 67 dead.

"From what we have now that is coming out of the investigation, the number of attackers was between four to six," police chief David Kimaiyo told Kenyan television station KTN.

At least 39 people are still missing after last week's brutal assault on Nairobi's Westgate mall by Islamist gunmen, the Red Cross said Monday.

The four-day bloodbath at the upmarket shopping mall, which Kenyan forces brought to an end on Tuesday, left at least 67 people dead.