A 9-year-old boy has admitted participating in the gang rape of his 8-year-old sister, police said today.

The boy persuaded his sister to enter an abandoned house and "to some degree directed the activities of the others," the St. Paul Police Department said.

Seven boys--ages 6 to 13--are suspected in the attack. Police questioned three Monday at an elementary school and the other four today.

The victim and her attackers were "playmates," police said.

Police said four of the boys, including her brother, raped the girl.

"It's a bad situation," police spokesman Michael Jordan said. "It's a terrible impact certainly on this little girl and possibly some of the boys."

No arrests have been made. A photo lineup was planned for Wednesday to enable the victim to identify her attackers.

The attack occurred on Sept. 7 or 8, but wasn't reported to police until last week by the victim's mother.

Originally, the girl had told police that one of her brothers heard her cries and tried to help, but that at least two of the suspects stopped him. That brother then left to get an older brother, who was able to rescue her, she told police.

After questioning seven boys who were in the vacant house at the time of the attack, police determined that her brother had been involved and had told her not to tell her mother what happened.