11.   Japan, which is a major hub for U.S. military facilities in the Asia-Pacific, has had several security scares since the U.S. attacks.

12.   Manchester airport has already had three security scares this year.

13.   The airport has already had three security scares this year.

14.   The crisis triggered the biggest security scare in decades and catalyzed concerns over the dangers of Islamic extremism in predominantly Muslim Malaysia, which has large religious minorities.

15.   The shooting was the latest in a string of security scares that have brought tighter protection for U.S. presidents.

16.   The shooting was the latest in a string of security scares that have brought tighter protection for the first family.

17.   There were no security scares or hoaxes.

18.   In the last publicised security scare, a robot was used last August to examine a suspicious package that turned out to be a box of baby wipes.

19.   But why this did not prevent the security scare has not been officially explained.

20.   But she cautioned the incident could turn out to be another of the security scares that have paralysed numerous US airports in recent months.