Explosions and gunfire were heard near the shopping mall in Nairobi, Kenya as government troops moved in this morning. Kenya's military says it has rescued most of the remaining hostages held there over the weekend. Terrorists stormed the mall this weekend and killed at least 68 people and injured more than 175. Five Americans were among those injured. Al-Shabab, an al Qaeda linked terrorist group based in Somalia, has claimed credit for the attack. It says it was targeting non-Muslims in retribution for Kenya's 2011 push into Somalia. President Obama has vowed to find the people responsible.