Kenya launched its official inquiry into the Nairobi shopping mall siege on Thursday as grieving families were waiting to collect the bodies of those killed in the attack.<br/> <br />U.S., British and Israeli agencies are helping with the investigation into the assault which claimed at least 72 lives.<br/> <br />Among those waiting outside the city mortuary there were fears for security in the future.<br/> <br />(SOUNDBITE)(Swahili) RICHARD NZIOKA MUNZAU, NAIROBI RESIDENT, SAYING:<br/> <br />"We're really afraid. If I wanted to buy a bag of flour I wouldn't go into a supermarket. I will look for some small shop near my house because the reports we're getting are not clear."<br/> <br />The Somali Islamist militant group al Shabaab said it carried out the attack on the Westgate shopping mall.<br/> <br />Its leader said in an audio message on the internet the siege was in retaliation for an incursion by Kenyan troops to crush insurgents in Somalia two years ago.<br/> <br />He also warned of more to come if Kenyan forces st
