YOKOHAMA -- A police sergeant and three other officers who provided cigarettes and a cell phone to a detainee have been punished, while another officer accused of injuring a detained youth was reported to prosecutors, law enforcers said.

The Kanagawa Prefectural Police Inspection Office announced punishments, including at least one 10 percent pay cut for six months, for the four officers on Tuesday. Among the four were a 56-year-old officer from Kagacho Police Station, and a 47-year-old senior officer.

Investigators said that the four supplied snacks to a 43-year-old truck driver who was being held on suspicion of intimidation, after he made a row during a police night shift in January. Later the man made threats, saying, "I'll tell your bosses (that you've violated regulations). I'll go wild." In response, the officers handed him cigarettes and gave him access to a cell phone on about 90 occasions. Their actions were uncovered in March.

In addition, police announced that a 39-year-old officer accused of violently treating three youths who made a row at a facility for juveniles at Kawasaki Police Station had been reprimanded. He was reported to public prosecutors on suspicion of injuring one of the youths.

"We want to work to prevent recurrences of such incidents," an Inspection Office official said.

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