Over the last two days more than 1500 people have taken part in special prayers at the mosque near to the family home of the Taufiq Al-Sattar family.
They have been supporting Muhammad Taufiq Al-Sattar, whose wife Shehnila, her teenage sons Bilal and Jamal and her 19-year-old daughter Zainab died after a fire ripped through their house in the Spinney Hills area of Leicester last Friday.
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A 49-year-old man is in hospital after suffering a serious head injury during a fight.
The missing 15-year-old boy was last seen on Monday 12 June close to a train station.
The 26-year-old had been spending the evening out with friends.