Mr. Norris also repeatedly came back to the bullying Daniel was subjected to at school as the most obviously troubling and unaddressed concern in the boy's life.

Gone for a moment here were worldly preoccupations, like soccer's World Cup, and troubling concerns about priests accused of abusing minors.

A far more troubling concern is the potential for illegally copying digitally delivered information.

There are, happily, exemplary exceptions to troubling concerns about male athletes and their lack of concern for women's issues.

But the most troubling concern, always implicit and sometimes explicit, was about the impact of Islamic fundamentalism.

They said this case raises troubling ethical concerns.

But critics say the rapid growth of the industry raises troubling concerns.

An equally troubling concern is Mr. Kohl's management of the German border issue during the campaign.

Also, there are some troubling concerns about a good chunk of his autobiography, including worries that maybe he was not exactly a multimillionaire.

Indeed, Haiti does raise troubling concerns.