A 31-year-old man from Kanagawa Prefecture was in critical condition Tuesday following Monday evening’s bomb blast in central Bangkok.

Kota Ando underwent emergency surgery, a local hospital said. It reported that his internal organs were damaged, but that he was conscious and his condition was stable.

The bomb exploded at Erawan Shrine, a street-side religious monument at an intersection in one of the Thai capital’s commercial districts. The explosion left at least 20 people dead and 125 injured.

Ando, an employee of East Japan Railway Co., was on loan to Tokio Marine and Nichido Fire Insurance Co. He had been working with the insurer’s Thai subsidiary since July, according to Tokio Marine.

Isetan Bangkok, the Thai branch of the Japanese department store chain, is located close to Erawan Shrine. The store is popular among Japanese tourists.

Tour operators in Japan have been trying to confirm whether their clients are safe. As of Tuesday, some were considering canceling optional tours within Bangkok.

The JTB travel agency said it has been in contact with 80 percent of the 200 people who were on its package tours in Bangkok on Monday. Because the bombing took place at dinner time, when many tourists were away from their hotels, the agency was unable to reach all of its customers, spokeswoman Miho Yamashita said.

Yamashita said whereas Bangkok tours might be canceled for travelers who are already there, for tourists yet to depart Japan the schedules remain on track because the firm’s stance is to comply with travel alerts issued by the Foreign Ministry.

On Tuesday, the Foreign Ministry issued a warning over the Bangkok explosion, urging people to avoid going out unless it’s urgent but left its overall travel alert level for Thailand unchanged at “exercise caution.”

The H.I.S. travel agency declined to state how many of its clients are currently in Bangkok but said it was a sizable number as August is the high season for international travel.

It has contacted 70 percent of them so far, with no injuries reported, said spokesman Satoshi Umemoto.

Public relations officials for Club Tourism and KNT Co. also declined to give the number of their travelers in Bangkok, but said all were safe.

They also said tours to Thailand will would continue. without interruption, pending any change in travel advisories from the Foreign Ministry.

Thailand is one of the most popular destinations for Japanese tourists. The Thai Tourism and Sports Ministry said the number of tourist arrivals from Japan stood at 1.27 million in 2014, behind only those from China, Malaysia and Russia.

Information from Kyodo, Jiji added

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