The Seijo Police Station in Tokyo's Setagaya Ward held an open meeting of investigators Saturday to discuss the unsolved murder of a family of four by an apparent lone home invader who struck on either late Dec. 30 or early Dec. 31, 2000.</PARAGRAPH> <PHOTO> <TABLE WIDTH='250' ALIGN='RIGHT' BORDER='0'> <TR> <TD><IMG ALT='News photo' BORDER='0' SRC='../images/photos2006/nn20061231a1a.jpg' WIDTH='250' HEIGHT='190'/></TD> </TR> <TR> <TD><FONT SIZE='1'><B>Masahito Kanetaka, who is in charge of a special police task force investigating the 2000 murders of Mikio Miyazawa and his family –

, speaks at the squad's meeting Saturday at Seijo Police Station in Setagaya Ward, Tokyo. KYODO PHOTO

"We (police) are the only ones who can settle the score for the family and their relatives. We'll leave no stone unturned," said Masahito Kanetaka, the lead investigator.

Mikio Miyazawa, 44, his wife, Yasuko, 41, their daughter, Niina, 8, and son, Rei, 6, were stabbed to death in their Setagaya Ward home apparently by a lone late-night intruder. Despite various evidence found at the scene, police have made no arrest.

The meeting was opened to the press as part of the police station's efforts to keep public interest in the case alive.

"Things the killer left shows part of the culprit's everyday life. We will keep trying to find out who did it," Minoru Nakahara, one of detectives on the case, told reporters.

A gray sweat shirt with purple raglan sleeves and neck were found in the house among other pieces of evidence, including indications that the killer suffered a deep stab wound to the hand.

Detective Toshihide Mochizuki urged the public to come forward if they have any information that might lead to an arrest.

After the meeting, Kanetaka visited the victims' still-vacant house and offered a prayer. Other investigators offered flowers.

Police will fan out in the area from 9 p.m. Saturday to Sunday noon to conduct interviews and other investigative tasks at 11 locations to demonstrate they are still focused on the case and to mark the timing of the slayings.

In August 2005, police officers donned sweat shirts similar to the killer's and stood outside nearby Keio Seiseki-Sakuragaoka Station, hoping someone would recognize the clothing, even though the killer was probably wearing a coat, since the slayings took place in late December.