The US Homeland Security secretary said Sunday she is working to prevent a possible wave of anti-Muslim sentiment after the shootings at Fort Hood in Texas. Janet Napolitano says her agency is working with groups across the United States to try to deflect any backlash against American Muslims following Thursday's rampage by Army Maj. Nidal Malik Hasan, a Muslim who reportedly expressed growing dismay over the wars in Iraq and Afghanistan. The shootings left 13 people dead and 29 wounded. Napolitano was in the United Arab Emirates Sunday for talks with security officials and a meeting with women university students in Abu Dhabi.