NAIROBI (Reuters) - Kenyan authorities are holding eight people in connection with a weekend attack by Islamist militants on a Nairobi shopping mall, while three others were released after questioning, the interior minister said on Friday. Somali Islamist group al Shabaab said its "warriors" stormed the mall on Saturday, holding out for four days in an assault that killed 67 civilians and members of the security forces. The government said five of the militants were also killed. ...