Muslims made a video only available in French called "Trappes , police , nikab , émeute , les médias vous mentent , voici ce qui s'est réellement passé [Trappes , police , niqab , riot , the medias lie to you , here what's really happened] : youtube.com/watch?v=9Wb93wIZp7M
Resume
(this resume is only about the arrestation) : They said that a woman with her husband and her child of four month had a control of identity
(all the family had this control of identity) by police officers
(when that happen you must show your "carte national d'identité" or national identity card [ID] in English language). They collaborated after the police said somethings like
"ici t'est en France [Here you're in France]" ,
"tenue de chauve-souris ce n'est pas le carnaval" [Clothes of bat this is not the carnaval]. The mother explain that she're not OK about what they said , a police officer pushed her
(the speaker don't know exactly what's happened because he said that he can't explain what's happened). The daughter take part in this conflict and said something like
"vous ne touchez pas à ma mère" [Don't touch my mother]. After they tell others violence commited by police officers. They busted the couple
(the speakers tell that the couple don't beat the police officers).
Personal think : They believe maybe really what they say or they practise the taqiyya
(Arabic : تقية).
What is it ?
http://en.wikipedia.org/wiki/Taqiyya
For me theirs version is probably untrue. I already saw muslims insult the police and fight with them (it was not in Trappes).
After the muslims accuse the police to beat them so then that they are those who started the battle , this is a classic.