Canadian rescue worker Kevin Sullivan from Vancouver holds the two rescued dogs of a Hurricane Katrina survivor in Chalmette, 11km (7 miles) east of New Orleans, Louisiana September 3, 2005. U.S. President George W. Bush ordered more troops to secure New Orleans on Saturday as rescuers evacuated thousands of desperate refugees and closed two huge shelters plagued by murder, rape and chaos. Rescuers are scouring the community for the first time Saturday for survivors of Hurricane Katrina.