Kenya has vowed not to bow to Shebab threats of more attacks if troops are not pulled out of Somalia, following a devastating mall attack in Nairobi by the Al-Qaida-linked insurgents.

"We went to Somalia because Al-Shebab was a threat to national security... We will continue to take action on that front until our security and interests in the country are protected," Interior Minister Joseph Ole Lenku told reporters on Friday.

Kenya has taken measures to protect valuable goods inside the sealed off Nairobi mall attacked by Islamist gunmen last week following reports that one jewelery had been looted.

"Our security forces are responsible people and we have put every mechanism in place to ensure that there will be no such criminal activity," Interior Minister Joseph Ole Lenku told reporters.

Kenya's interior minister said Friday the country would not bow to Shebab demands to pull troops out of Somalia following a devastating mall attack in Nairobi by the al-Qaida-linked insurgents.

"We went to Somalia because Al-Shebab was a threat to national security... We will continue to take action on that front until our security and interests in the country are protected," Joseph Ole Lenku told reporters.

Somalia's Shebab on Friday threatened fresh attacks against Kenya, as police scoured the smoking rubble in Nairobi's Westgate mall devastated by their assault for bodies and clues.

The Al-Qaida linked Shebab gloated at the massacre of at least 67 people in the mall, which saw a group of gunmen storm the part Israeli-owned complex at midday Saturday, firing from the hip and hurling grenades at shoppers and staff, before holding off Kenyan and foreign forces with a barrage of bullets for four days.

Burundi and Uganda said Thursday they had beefed up security after the Shebab's deadly Nairobi mall attack amid fears the extremists would now strike Kenya's military partners in Somalia.

Kenya, Uganda and Burundi contribute most of the 17,700 soldiers in the African Union's AMISOM force battling the Shebab in Somalia.

Britain on Thursday revised down the number of British people killed in the Nairobi shopping center attack from six to five, saying one of those previously identified was Kenyan.

"We can now confirm that on present information five British nationals have been killed in the recent terror attacks in Nairobi," a spokesman for the Foreign Office said.

Abdurahman Issa Mohammed, a Somali refugee in his sixties dressed in a smart shirt and blazer, says he has "not one grain of support" for the Islamist attackers from his country behind the Westgate Mall massacre.

But he is scared of what may come next.

The Shebab's bloody siege of a mall in Kenya confirms the Somali group's successful transformation from a guerrilla army into a leaner organisation focused on terrorist attacks, analysts said.

The September 21 raid and ensuing hostage crisis that killed at least 67 people was the most spectacular in the group's seven years of existence and boosted the Shebab's prestige in the jihadi world.

Fred Bosire, who works in the meat section of the supermarket at Nairobi's Westgate shopping mall, was having an ordinary, busy Saturday before the carnage began.

A staffer at the Nakumatt supermarket located in the back of the complex, he was immediately trapped along with hundreds of colleagues and shoppers when gunmen marched in and raked the supermarket aisles with automatic weapons fire.

The Nairobi mall carnage in which several foreigners were killed by Islamist fighters was a "message to Westerners" who supported Kenya, Somalia's Shebab chief said in an audio message Wednesday.

Reclusive rebel supremo Ahmed Abdi Godane said the four-day bloodbath was a warning to Westerners who "backed Kenya's invasion (of Somalia) that has spilled the blood of the Muslims for the interest of their oil companies."