The work of investigators continues.
The man suspected of injuring six people for an undetermined reason at the Gare du Nord on Wednesday morning was still hospitalized on Friday, while the man likely to have lodged him was released at the end of the afternoon without prosecution in this stage, said the Paris prosecutor's office on Friday.
The state of health of the main suspect - who was shot in the chest and arm during the intervention of the police - did not allow the resumption of his custody, said the source.
He had been placed in police custody on Wednesday evening for attempted assassination, but this measure had been lifted late Thursday afternoon for health reasons.
The investigators are trying to understand the reasons which led the attacker to attack several people in the Parisian station, at a busy hour.
His identity is still being checked.
Paris prosecutor Laure Beccuau said in a statement on Wednesday that around 6:45 a.m., he "suddenly began, for no apparent reason at this stage, to strike a first victim with his weapon, a victim to whom he struck about twenty blows with a "metal hook".
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A total of six people were injured: two men aged 41 and 36, a 46-year-old policeman assigned to the border police (PAF) at the Gare du Nord, and three women aged 40, 47, and 53.
The identity of the attacker is still being verified.
He is indeed "registered under several identities in the automated fingerprint file fed by his statements during previous procedures of which he was the subject", indicated the prosecutor Beccuau.
Investigators must now determine if either of these identities is the correct one.
Another man, who may have hosted him, was taken into custody on Wednesday evening and was released late Friday afternoon without prosecution at this stage, the prosecution said.