UPDATE:

The suspect
France: President Macron Confirms Lyon Explosion is ‘Attack’, Eight Injured (breitbart, May 24, 2019)
https://www.breitbart.com/europe/2019/05/24/france-president-macron-confirms-lyon-explosion-is-attack-eight-injured/
“At least eight are reported injured after a blast ripped through a street in Lyon, France Friday afternoon. French President Emmanuel Macron has called the incident an “attack”.
The suspected parcel bomb detonated on Victor-Hugo Road in Lyon, south-east France around 1730 eastern Europe time (1130 ET) and is reported to have been a package stuffed with “nails, screws, bolts”. The eight injured, which includes an eight-year-old girl, are reported to have sustained light injuries.
Lyon newspaper Le Progress reports French President Emmanuel Macron, who spoke of an attack about the explosion, remarking; “There was an attack in Lyon… there are no fatalities. There are wounded, so I obviously want to have a thought for the wounded, their families.”
BREAKING France 24:
At least seven hurt in central Lyon explosion; package bomb suspected
(French prosecutors)
Police are hunting “a man in his 30s”
That narrows it down doesn’t it?
Macron calls Lyon blast ‘attack’
France: President Macron Confirms Lyon Explosion is ‘Attack’, Eight Injured (breitbart, May 24, 2019)
https://www.breitbart.com/europe/2019/05/24/france-president-macron-confirms-lyon-explosion-is-attack-eight-injured/
“At least eight are reported injured after a blast ripped through a street in Lyon, France Friday afternoon. French President Emmanuel Macron has called the incident an “attack”.
The suspected parcel bomb detonated on Victor-Hugo Road in Lyon, south-east France around 1730 eastern Europe time (1130 ET) and is reported to have been a package stuffed with “nails, screws, bolts”. The eight injured, which includes an eight-year-old girl, are reported to have sustained light injuries.
Lyon newspaper Le Progress reports French President Emmanuel Macron, who spoke of an attack about the explosion, remarking; “There was an attack in Lyon… there are no fatalities. There are wounded, so I obviously want to have a thought for the wounded, their families.”
The President was joined in his comments by populist political rival Marine Le Pen: “I give my full support to the wounded in an explosion in Lyon, the light will have to be shed on the circumstances of this terrorist attack.”
Lyon Mayor Denis Broliquier said: “certainly, it was a device intended to hurt, it was an explosive device… I was warned by several direct witnesses. The explosive device was in a bag, deposited by a man, filmed by the CCTV of the city of Lyon.”
The Paris terrorism police have launched an investigation into the blast, confirming the government considers it to have been a probable terror attack.”
https://twitter.com/LCI/status/1131979421878034433
DAILY MAIL – Anti-terror police hunt man seen leaving parcel bomb in Lyon that left ‘at least 13’ injured including an eight-year-old girl, as Macron condemns the ‘attack’
Police said several people had been injured in the blast on a busy street in Lyon
The so-called ‘parcel bomb’ appeared to be filled with nails, screws and bolts
The area where the bomb explosion occurred has now been evacuated by police
The suspected bomber, a man in his 30s, was captured on CCTV, officials say
At least 13 people including an eight-year-old girl have been wounded in a suspected terrorist nail bomb attack in the French city of Lyon, with police hunting a man in his 30s.
A massive explosion was heard just after 5.30pm on a busy street in the city centre, with authorities saying a man on a bicycle was seen placing a bag on the ground just moments before.
Eleven of the victims were rushed to hospital from the scene of the attack outside a bakery in the Victor Hugo square, but their injuries were not thought to be life threatening.
‘Anti terrorist officers are at the scene along with other police,’ said a spokesman for the local emergency services.
‘A man in his mid 30s was seen placing a possible parcel bomb, and a hunt has been launched to try and find him.’
French President Emmanuel Macron interrupted a TV interview about the European Parliament elections to announce: ‘There’s been a bomb attack in Lyon, there are injuries’.
A girl aged eight is among the injured,’ said local police union spokesman Alain Bardelis said.
‘There was a crowd movement after the man was scene placing the bags on the ground.
‘The blast was on the corner of Victor Hugo and Sala streets, which have now been blocked off.
‘Military and police forces are on the streets, along with anti-terrorist officers.’
The suspected bomber had his head covered and was wearing dark glasses, but was caught on CCTV, Mr Bardelis confirmed.
‘He was wearing a dark top and Bermuda shorts,’ the officer added. ‘Municipal cameras would have caught him on his bike.’
Another witness living in a flat on Victor Hugo said: ‘We heard a monstrous noise, and our windows came in. We could see that people were running everywhere down below. I saw people wounded.
‘The explosion was from the pavement in front of the bakery. We’ve heard it was a bomb packed with nuts and bolts.’
President Emmanuel Macron called the blast an ‘attack’ during a live Facebook interview, adding that no deaths had been reported ‘for the time being.’
‘It’s not for me to give a toll but it appears there are no casualties. There have been injuries, so obviously I’m thinking of these injured and their families,’ Macron said.
David Kimefeld, president of the metropolis of Lyon, said: ‘I condemn with the utmost firmness the bomb attack that took place in the late afternoon Rue Victor Hugo in Lyon.
‘My first thoughts go to the victims and their families. I salute the courage of firefighters who mobilized very quickly to help the victims.
‘This barbaric act reminds us that the fight against terrorism is a daily battle and that we must never relax our vigilance.’
The cause of the blast wasn’t immediately known, said Kamel Amerouche, the regional authority’s communications chief.
Amerouche told The Associated Press the victims had leg injuries that weren’t life-threatening.
He said the explosion occurred in or outside a store of the bakery chain Brioche Doree and the area had been cordoned off by police.
Live television images of the street showed the Brioche Doree sign intact and police vans and an ambulance at the scene.
https://www.dailymail.co.uk/news/article-7067929/At-eight-people-hurt-parcel-bomb-explodes-Lyon.html
From what I can tell about France there is a plethora of disgruntled groups and individuals with a motivation to do some thing like this.
Whenever I read a French gov reaction to attacks on its citizens, recall:
1980
https://en.wikipedia.org/wiki/1980_Paris_synagogue_bombing
https://en.wikipedia.org/wiki/Raymond_Barre
The Prime Minister, Raymond Barre, on 3 October said on TF1
“A hateful attack which wanted to strike at the Jews who were in that synagogue, and which struck innocent French people who were crossing the street.”
France… je suis Lyon…and few candles…Now…let’s finish our beers.
They sure have gotten over Notre Dame in a big hurry. I guess it wasn’t that big a deal. Routine, really…just life in the big city, I guess… No big woof…