Japan announced the first signs that contamination from its tsunami-crippled nuclear complex has seeped into the food chain, saying that radiation levels in spinach and milk from farms near the facility exceeded government safety limits. Japanese officials insisted that the small amounts of radiation with traces also found in tap water in Tokyo posed no immediate health threat, and said the situation at the Fukushima Daiichi plant, while still unpredictable, appeared to be coming under control after near-constant dousing of water to prevent spent fuel rods from burning up.