The containment structures at three reactors at Japan's tsunami-crippled nuclear plant are intact, according to U.S. regulators. Smoke rose from two of the units Monday, forcing workers trying to cool them to pull back. The cause of the smoke at the Fukushima Dai-ichi plant was under investigation. Early in the day, the Health Ministry advised one village about 20 miles (30 kilometers) from the plant not to drink tap water due to elevated levels of iodine. Still, the government said the radiation levels were too small to pose an immediate health risk. The sale of produce from some regions has been banned after traces of radiation were found. The World Bank said rebuilding after the earthquake and tsunami may cost $235 billion.