Norway said on Thursday that one of its citizens may have been involved in the attack on a Kenyan shopping mall last month which killed at least 67 people and was claimed by Somali Islamist militants. More than two weeks after the mall assault, the worst attack on Kenyan soil since al Qaeda bombed the U.S. Embassy in 1998, it remains unclear how many gunmen were involved and what their nationalities were. Kenyan government officials at the time of the raid said 10-15 militants had stormed the upscale mall, but so far only four have been named.