What is an 'interesting coincidence'?

Intelligence and Security Committee report on the July 7 bombs

Is everyone in the ISC singing from the same songsheet? I only ask because at p68, I was struck by a jarring note in the otherwise soothing harmony: the gratuitous inclusion of the phrase 'astonishing coincidence'. On a still more discordant note: 'interesting coincidence'. Taken literally, this expression is pretty much an oxymoron. I would normally take it to be an archly ironic way of suggesting that the 'coincidence' might not be coincidental at all. Surely no-one on the committee is giving credence to a covert action hypothesis?