Gathering the mortal remains of the martyrs

Praise
be to Allaah.

The mortal remains of the martyrs are like those of other
people, the mortal remains of each martyr should be buried in a grave
of his own, unless it is too difficult to bury each one on his own,
because there are too many dead owing to disease, killing etc. (In that
case) it is OK to bury two or three in one grave, and the one who was
best in religious commitment should be placed closest to the qiblah,
as the Prophet

(peace and blessings of Allaah be upon him) did with those who were
killed at Uhud. 

And Allaah is the Source of strength. May Allaah bless
our Prophet Muhammad and his family and companions, and grant them peace.