21.   There are too few detention officers, a situation that worries police officials.

22.   This selling by long-term investors, Persaud said, may have been one of the factors that truly worried Japanese officials.

23.   This worries health officials because folic acid is crucial in preventing spina bifida and other spinal and brain birth defects, known as neural tube defects.

24.   What worries security officials are indications short of proof of links between the nominally peaceful and increasingly violent groups that have been committing the majority of the recent attacks.

25.   What especially worries senior military officials is that Croatia might move soon to enter the war, triggering a wider and deadlier conflict.

26.   While youth violence in general is dropping, the incidents of multiple homicides is actually rising, says Hammond, a figure that worries CDC officials.

27.   A marked increase of violence directed at international peacekeepers serving in the NATO-led force in Kosovo has officials worried.

28.   Also worrying officials is the sharp increase in congenital cases.

29.   An unduly strong yen worries officials here because it can make Japanese exports more expensive abroad, and thus less competitive in world markets.

30.   And the prospect of more refugees if other enclaves fall worried aid officials.