BBC correspondent Andy Tighe: Still no indication of who was behind the bombings

More than 150 people were killed and more than 4,000 injured in attacks on US embassies in Kenyan capital Nairobi and Dar es Salaam, capital of neighbouring Tanzania.

Mr Cook told BBC One's Breakfast with Frost: "It's an illustration of the worst kind of the use of violence against innocent people for political ends.

"We certainly will be supporting our American colleagues in doing everything possible to make sure that justice is done to those who carried out this mass murder."

Robin Cook: We have offered every possible help

But he did not yet know who was responsible for the bombings.

Mr Cook said: "We do not know, and I think it would be unwise and rash to speculate as to who might be responsible.

"The Americans are putting enormous effort into now getting on with the forensic work.

Robin Cook: We shall be doing everything possible to make sure justice is done

"We have offered them every possible help we can of an intelligence, security, forensic kind. We already have been of assistance on the site." he said.

A planeload of emergency medical supplies sent by the UK's Department for International Development arrived on Sunday.

A team of three UK plastic surgeons and trauma specialists is on stand-by to fly out.

Meanwhile, it emerged that the 25-strong British Army detachment in Nairobi which has been recovering corpses from the rubble of destroyed buildings, may receive counselling.

A man is stretchered from the rubble

Major Jim Bain of the British Army Training Liaison (Kenya), said: "The boys have done a remarkable job and morale has been excellent, but it has been a gruesome task and it is a long time since they were able to find anyone still alive.

"They have stood up to the trauma of it all very well.

"We don't have counsellors out here, but we will be assessing all of the men over the next few days and if there is any sign of deterioration then counselling people will be flown out from the UK."

Kenyan President Daniel arap Moi said investigators hunting the perpetrators of the outrage were pursuing a number of leads after retrieving "several clues" from the blast site.

Churches in the Kenyan capital were holding special Sunday services to pray for victims, the bereaved and the two dozen people still in a critical condition in Nairobi hospitals.