おそれがある vs おそれあり


I recently found an example of おそれあり in a fictional headline

> 「ネットワークしはい計画が本格的にはじまったおそれあり」だって

Presumably this is "It says 'It may be that their plan for network domination
has begun to go all out'"

The only example of おそれあり I was unable to find a dictionary definition, and
could only find signs like "落石のおそれあり" through Google. Am I correct in that it
is just a version of おそれがある? If so, what exactly is the nuance between these
two phrases?

