FUKUSHIMA, Japan (AP) - It's not clear exactly what is going on at a nuclear plant in northeastern Japan, but conditions there appear to be worsening.
Workers who've been dousing nuclear reactors with seawater to cool them were pulled out of the plant after radiation levels spiked. The government says that likely happened when white clouds drifted up from one of the reactors.
The radiation is believed to have come from Unit 3, where workers are struggling with a fuel storage pond that's believed to be leaking radiation. They're also contending with possible damage to the containment vessel.
After several hours, the radiation levels decreased and the workers were ordered to return to the site.
It's not clear not clear what, if any, operations continued while the workers were gone.
At one point, national broadcaster NHK showed military helicopters lifting off to survey radiation levels above the complex, preparing to dump water onto the most troubled reactors. The defense ministry later said those flights were a drill, and it had no plans to make a water drop from the air.