The Mall of America has stepped up security following the deadly attack by the Somali militant group al-Shabab at a mall in Nairobi, Kenya. Officials at the Bloomington mall say some of the extra security precautions will be noticeable and some won’t be. Millions of people visit the mall and its 500 stores each year. Minnesota is home to the largest Somali community in the U.S. At least 22 young men have traveled to Somalia since 2007 to join al-Shabab and the FBI says its investigation of the terror group’s recruiting remains a priority. There’s no confirmation of any American involvement in the Nariobi attack that has reportedly killed at least 61 civilians.