This mini-series was an overall disappointment to me in large part due to their not showing English subtitles when the characters spoke English. If languages other than English were spoken the dialogue was subtitled, but not for English.
I bought this film largely due to the presence of English subtitles as I have a serious hearing impairment, so their absence made the film extremely hard for me to follow.
From what I could hear, the story itself was mostly true, and it showed what went on in the minds of terrorists of that era.
But, if you speak and understand English and have a serious hearing problem, be warned that this film will likely be hard to understand.