One defendant told investigators that she had received anonymous telephone calls warning her not to deal with law-enforcement agents, a person who has read investigative files on the case said.

The police said that after Mr. Lee was slain, about a half-dozen concerned neighbors made anonymous telephone calls to the Police Department's tips line.

This time there was no such information, and the anonymous telephone calls to the Israeli radio saying Hamas was responsible were so muted that some commentators wondered whether Hamas was, indeed, to blame.

Since showing it to a black couple around Labor Day, he said, his son had received several anonymous telephone calls threatening to burn the trailer.

The threat came in two anonymous telephone calls to the All England Club and a third to a British newspaper, a police official said.

The State Health Department's inspection of Lincoln Hospital followed assertions by nurses who complained in anonymous telephone calls to news organizations that two infant deaths at the hospital's maternity ward resulted from severe understaffing.

The drug traffickers said in a statement that anonymous telephone calls to radio stations claiming that they had killed Mr. Pizarro on Thursday had actually been made by the police.

Last year, there were more than 30 such evacuations, all sparked by anonymous telephone calls to 911.

The senator said his committee received many anonymous telephone calls complaining about both the agencies - many from employees who were attacking their rival agency.

After he returns home, he receives anonymous telephone calls advising him to make funeral arrangements.