A pall of smoke hangs over the Westgate shopping mall in Nairobi on Wednesday.<br/> <br />Kenya's president has declared three days of mourning for those killed in the siege that began at the weekend.<br/> <br />At least 67 people lost their lives when gunmen stormed the shopping centre in the Kenyan capital.<br/> <br />The exact number of dead is far from clear.<br/> <br />Three floors of the building collapsed as the drama neared its end.<br/> <br />An unknown number of bodies are lying under the wreckage of steel and concrete.<br/> <br />More than 60 people are still unaccounted for.<br/> <br />The Somali Islamist al-Shabab linked to al Qaeda claimed responsibility for the siege.<br/> <br />They struck during lunchtime on Saturday, spraying bullets and grenades at shoppers and security guards before taking hostages.<br/> <br />Kenyan authorities have not confirmed intelligence reports that British and U.S. militants were among the attackers.
