Check out the video posted on youtube.. it will probably be taken down in a few days once it starts to spread 😉
It *could* be a prank and gardai having a bit of craic amongst themselves, but this is Ireland so it wouldn’t surprise me if 1; the caller was genuine and 2; the gardai was genuinely at work 
[youtube]http://youtube.com/watch?v=GFnFD8Ocg4c[/youtube]