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A powerful earthquake with a preliminary magnitude of 6.1 rattled the Kanto region Monday morning, the Meteorological Agency and police said.

No tsunami warning was issued for the 7:22 a.m. quake, which registered an intensity of upper 5 on the Japanese seismic scale to 7 in southern Ibaraki and northeastern Chiba prefectures. No casualties were reported.

It was the first time the inland Kanto region has been struck by a quake with an intensity of upper 5 or stronger since the current intensity scale was introduced in 1996.

The government has set up a liaison office at the crisis control center of the prime minister’s office.

Runways at Narita airport were closed for about 15 minutes after the quake, airport officials said. No irregularities were found, they said.

The quake prompted suspension of about 120 train runs and delayed 41 others operated by East Japan Railway Co., affecting about 37,800 passengers on JR lines, including the Sobu, Narita, Togane and Kashima.

About 180 passengers of a Choshi-bound Sobu Line train were crammed inside its six cars for about an hour after the train was stopped between Iikura and Yokaichiba stations by the quake. The passengers later left the train and walked along the tracks toward Yokaichiba Station.

About 30 passengers were inside a Kashima Line train for more than three hours as the four-car train stopped on a bridge near the Tone River after it departed Sawara Station.

Bullet train services were also partially suspended on the Tohoku, Joetsu and Nagano Shinkansen lines.

In Chiba Prefecture, the quake registered an upper-5 intensity in the towns of Omigawa and Hikata, and the cities of Yokaichiba and Asahi. It also recorded an upper 5 in Kamisu, Ibaraki Prefecture.

It measured a lower-5 in the towns of Tako and Nosaka, and the city of Sawara, all in Chiba Prefecture.

No damage was reported at the nuclear plant in the village of Tokai, Ibaraki Prefecture.

At Yokaichiba City Hall, about 10 windows were shattered or cracked, city officials said.

A Meteorological Agency official said major aftershocks are unlikely.

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