The prospect of more such particles is likely to worry many.
Initiatives likely to worry or annoy Irish voters are being played down or delayed.
Indeed, grandmothers would have received the "most likely to worry" award yesterday.
Although the biggest impact is felt by residents, the increased tension is likely to worry World Cup organisers.
Even in times of conflict, they are likely to worry more about personal issues than the world at large.
But even without the threat of attack, the announcement is likely to worry those countries within range of the attacks.
But a scrappy opening half is likely to worry Richardson, likewise a couple of undisciplined elbows from veteran Leigh Montagna.
Among ideas likely to worry Britain, Belgium suggests a further reduction in policy areas subject to national vetoes.
18-24s are most likely to worry about house prices (69%), 25-34s and 35-54s are both most likely to worry about the NHS (47% and 60% respectively), while Britons aged 55+ are most likely to worry about terrorism (70%).
If the summer drags on with no progress, more players and agents are likely to worry about the loss of paychecks.
Unlike dog owners, cat owners aren't likely to worry if they don't know where their pats are - even if they live in a tiny flat.
