Police in Thailand say a group of Japanese men arrested last week for allegedly running a call center scam defrauded more than 100 people in Japan.
Fifteen Japanese men were arrested on March 29 on suspicion of working illegally in the country. They were captured in a raid on a house in the resort city of Pattaya.
The men range in age from 22 to 54.
The police have found, through interrogations and seized documents that the men defrauded their victims of at least 220 million yen, or more than 2 million dollars.
The police say the men were rarely seen by their neighbors as they seldom went outdoors and had their meals delivered.
The confiscated materials included data on the victims health and living conditions and information about nearby convenience stores.
The materials also indicate that the suspects thoroughly researched their victims beforehand.
The 15 suspects have reportedly declined to answer questions by Thai police.
A chief investigator told NHK that all the men, including the younger ones, appear to be calm. The officer described them a well-trained group.
The Thai investigators say they will hand over the confiscated materials to Japanese police and begin procedures to extradite the suspects to Japan.