As the investigation by Egyptian police into the bombing of a Coptic Church in Alexandria goes on, there have been a number of reported arrests.

Among those held are a group of conservative Islamic followers known as Salafists.

Scores have been reportedly arrested by police over recent days -- one of them, 31-year-old Sayyed Bilal, is now dead.

His family says Bilal died as a result of torture, and they have filed an official complaint with the prosecutor's office.

Al Jazeera's Zeina Khodr reports from Alexandria.