Leaders of about four dozen nations and non-government organizations were called to Washington to discuss security of nuclear materials.
U.S. President Barack Obama convened the high-profile meeting to look into what he called the most severe security issue for the United States -- the possibility that a terror group such as al-Qaida obtained nuclear materials and used them in an attack on U.S. interests.
The environmental mess continued Wednesday as sewage treatment plants in Warwick and West Warwick remained inundated by the high waters and a major sewage pumping station in Cranston failed, The Providence (R.I.) Journal reported.
"The Pawtuxet River, from whatever sources, is being impacted by raw wastewater," said William Patenaude, an engineer at the state Department of Environmental Management who coordinates local sewer system programs. "This might be a historic first. This is obviously a situation beyond anything we're used to dealing with."
People in Warwick and other communities are being asked to conserve water by not taking showers, flushing toilets only when necessary and not running dishwashers or washing machines, the newspaper said.
"You had such a great number of businesses that were caught off guard; they didn't take steps to prevent this from happening," said Daniel Butler, vice president of retail operations for the National Retail Federation in Washington. "So it's going to be a longer recovery period."
USA Today reported the flood levels are unprecedented since Rhode Island began keeping records in the 1870s.