And it's exactly why everyone is bringing up the "need" for EU investigative force. We know this isn't going anywhere and it happens often, even in the "advanced industrialized countries" we hold so dear.
https://www.timesofmalta.com/articles/view/20171016/local/fo...
See for example https://en.wikipedia.org/wiki/Anna_Politkovskaya
Assassination = murder of a prominent person for political reasons, often carried out by a third party (an assassin).
Slaying = a killing. That's it. Besides not having any political motive, a slaying isn't even necessarily murder; killing someone in war, in self-defense or on accident is still a slaying.
Some AP stories from the past two weeks found with a quick Google using "slaying" to refer to the killing of humans:
* https://www.usnews.com/news/us/articles/2017-10-12/3-people-...
* https://www.seattletimes.com/nation-world/philly-man-arreste...
* https://www.usnews.com/news/best-states/connecticut/articles...
I don't know what the etymology of the word is, but I get the impression it implies death by close combat. I personally wouldn't describe a bomb victim as having been 'slain'.
There could also just be a translation thing going on here, by someone whose first language isn't English.
This was somewhat remote for the killer, possibly professional and likely politically motivated so assassination seems appropriate.
A murder-for-hire of a prominent politician committed by a third party with a car bomb on behalf of someone is not an assassination it was commissioned by their cheated-on spouse.
On the other hand, a politician or journalist being stabbed for political reasons is an assassination. For example, https://en.wikipedia.org/wiki/Inejiro_Asanuma.
Motive isn't always clear right after the event occurred. Could very well be speculation at that point.
Anyone can be a journalist btw. It isn't a protected profession with a title or degree requirement. "Professional journalism", OTOH..
Assassination implies a very specific target. A bomb does not inherently and more often implies the intent of broad targeting.