Police held back hundreds of Japanese fans Tuesday as Princess Diana visited a senior citizens' center and a cemetery for British soldiers who died in World War II.

The 33-year-old British princess is on a trip to Japan that marks her return to public life. She stepped out of the limelight in 1993 after the breakup of her marriage to Prince Charles.Residents at the Kitamachi senior citizens' center in Tokyo sang to Diana Tuesday morning. In the afternoon, she laid a wreath at the Hodogaya Commonwealth Cemetery in Yokohama, southwest of Tokyo. Most of the 1,738 soldiers buried there died as prisoners of war or were killed en route to Japan.

The princess made no public comments during the day's activities.

Diana is on her third trip to Japan and her first without Charles. She arrived Monday and will depart Thursday. Her stay is devoted mainly to touring hospitals and public health facilities.