Why are there no descriptions

Yes.

Tbf I'm always losing things.  If it's not my car keys then it's my primed hand grenade.

Back in my day it was all blondes and free love.

And as for the girls!!!!  ho ho

Did OP read the story or just see it was in the Guardian and guess the rest?

It clearly says: Detectives are appealing for information to trace the three black male suspects, all believed to be youths, who ran away after the attack.

Not much of a description, to be fair, aside from that there were three of them running.

Hand Grenade crime has emerged out of nowhere to be a significant feature of crime statistics in Sweden over the last 5 years, and an ever-present threat to the leading towns and cities. One particularly noteworthy city, famed for being a Non-Integrated Multicultural Paradise has it seems disproportionately been the scene of umpteen grenade attacks.

Where on earth did this phenomenon come from?  What's changed about Sweden this last 5 years or so to have placed grenade crime centre stage? 

Try as I might I don't recall too many people with names like Ulvaeus, Andersson, Lyngstad, Faltskog or Borg lobbing grenades at all and sundry in less 'progressive' times.

@saddo -- They had good pictures and released them only yesterday. Two already banged up and charged. Did they really need to give them extra time and chance to escape justice because they were not white boys?

Most likely the police already knew who carried out the attacks, and were appealing for witnesses to the crime, not for help in identification.