TOKYO — A powerful typhoon slammed into Japan’s east Wednesday, leaving six people dead or missing in south-central regions and halting trains in Tokyo before grazing a crippled nuclear plant in the tsunami-ravaged northeast.

Officials at the Fukushima Dai-ichi plant, where engineers are still struggling with small radiation leaks due to tsunami damage, expressed relief that Typhoon Roke’s driving winds and rains caused no immediate problems there other than a broken security camera.

“The worst seems to be over,” said Takeo Iwamoto, spokesman for plant operator Tokyo Electric Power Co., after the storm passed just west of the plant and then headed north.

More than 200,000 households in central Japan were without electricity late Wednesday. Police and local media reported that at least six people were dead or missing in southern and central regions, mostly from being swept away by rivers swollen with rains.

The storm, packing sustained winds of up to 100 mph (162 kph), made landfall in the early afternoon near the city of Hamamatsu, about 125 miles (200 kilometers) west of Tokyo. The fast-moving storm went past the capital in the evening and then headed into the Tohoku region, which was devastated by the March 11 tsunami.

In Tokyo, where many rush hour commuter trains were suspended, thousands of commuters trying to rush home were stuck at stations across the sprawling city.

“The hotels in the vicinity are all booked up, so I’m waiting for the bullet train to restart,” Hiromu Harada, a 60-year-old businessman, said dejectedly at Tokyo Station.

Fire department officials reported three people injured in Tokyo. In the trendy shopping district of Shibuya, winds knocked a tree onto a sidewalk, but no one was hurt. Pedestrians struggled to walk straight in powerful winds that made umbrellas useless.

At the Fukushima plant, engineers are still working to stabilize the reactors six months after three of them melted down when the tsunami disabled the plant’s power and back-up generators.

Iwamoto said the cooling system for the reactors, crucial to keeping them under control, survived the typhoon. However, a closed-circuit camera that shows exteriors of the reactor buildings abruptly stopped, and plant workers were investigating the cause of the problem, he said.

Some construction work around the plant had been canceled, and workers were trying to prevent pools of contaminated water from flooding and leaking outside the complex.

“The contaminated water levels have been rising, and we are watching the situation very closely to make sure it stays there,” Junchi Matsumoto, another power company spokesman, told reporters.

Heavy rains caused floods and road damage in dozens of locations in Nagoya and several other cities, the Aichi prefectural (state) government said.

Parts of Japan’s central city of Nagoya, about 170 miles (270 kilometers) west of Tokyo, were flooded near swollen rivers where rescue workers helped residents evacuate in rubber boats.

Police in nearby Gifu prefecture said a 9-year-old boy and an 84-year-old man were missing after apparently falling into swollen rivers.

More than 200 domestic flights were canceled and some bullet train services were suspended.

Toyota Motor Corp., Japan’s No. 1 automaker, shut down its plants as a precaution.

Machinery maker Mitsubishi Heavy Industries told workers at its five plants to stay home, company spokesman Hideo Ikuno said.

Nissan Motor Co. spokesman Chris Keeffe said workers at its Yokohama headquarters and nearby technical facilities were being told to go home early for safety reasons, and that two plants were not operating.

A typhoon that slammed Japan earlier this month left about 90 people dead or missing.