I'm trying to locate a word or phrase which describes this situation: when a relatively unusual news item is reported and then, in the following days, suddenly other examples of the same thing are reported.
It tends to happen with stories like dog attacks. What brought it to my mind this time was the execution of Cecil the lion being followed by reports (apparently untrue) of the death of Jericho the lion. A second lion story was covered because of the huge interest in the first story.
The word or phrase I'm looking for is likely to be of recent origin.
A similar concept is "frequency illusion", where the mind is biased to observe patterns where none exists - for example, you see a blue car and suddenly you keep noticing blue cars and you think that blue cars are much more common than they really are.