The militants who led the attack on a Kenyan mall hired a shop there in the weeks leading up to the siege, senior security sources have said. This gave them access to service lifts at Westgate, enabling them to stockpile weapons and ammunition. Having pre-positioned weapons, they were able to re-arm quickly and repel the security forces. Sixty-seven persons are known to have died in the four-day siege. Kenya's Red Cross says 61 others are still missing.