Trial of the Strasbourg attack: the blurred contours of Chérif Chekatt's profile. Four people are on trial for having, to varying degrees, participated in providing weapons to this 29-year-old from Strasbourg.

The court heard from one of Ch erif Cekatt's brothers, his father and Michael Chiolo, a former fellow inmate who will be tried next year for stabbing two prison guards. But after nine hours of hearing, the  contours of Chérif Chekatt’s profile remain unclear.