UPDATE
The two perpetrators are Egyptian brothers known to the police who were to be expelled.
On the night of Friday to Saturday February 4, two people were arrested in Champigny-sur-Marne, ÃŽle-de-France, for “damaging private property by setting fire to it, carrying a prohibited weapon and advocating terrorism”.
The two individuals were trying to set fire to a rubbish bin while shouting “Allah Akbar”. The police intervened at around 7.30pm. In view of the police, one of them, who was holding a knife (a 15-centimetre blade), tried to get rid of his weapon by throwing it into a bin.
The other was also carrying a knife, a kitchen knife with a blade estimated to be 10 centimetres long. The latter “continued to invoke the takbir (name given to the prayer Allah Akbar, editor’s note) during his arrest” […]. Le Figaro