Police were warned to be on the alert for possible terrorist activities aimed at the Japanese royal family, while doctors reported Monday that Emperor Hirohito was in stable condition after losing a large amount of blood the previous day.

Bedridden at his residential Fu-kiage palace in downtown Tokyo, the 87-year-old monarch was reported in stable condition by the Imperial Household Agency as he entered the second month of his fight against suspected abdominal cancer.The head of the National Police Agency, Akio Kanazawa, told a meeting of police officers they should be on the lookout for "terrorist activities" by both opponents and supporters of the 2,600-year-old imperial system.

Kanazawa warned of possible attacks by leftists who fear the imperial system could be strengthened as a result of the nationwide outpouring of sympathy for Hirohito since he fell ill Sept. 19.