Islamist lynch mob throw teenage boy off 20ft ledge before beating him to death (GRAPHIC IMAGES)

A teenager has been killed in Egypt after an Islamist mob threw him off a ledge on top of a roof and beat him as he lay dying, local media reports.

The young man, identified as Hamada Badr, 19, and his three friends were caught on camera hiding from a large group who had chased them onto a terrace in Alexandria.

The video, apparently filmed with a mobile phone camera from across the road, show the four teenagers escaping onto a 20ft ledge during violent protests on Friday.
The violent mob on the street appear  to have chased them to the roof and the boys climb onto the structure as a group of agitated men gather around them.
The boys had been out celebrating the ousting of Islamist president  Muhammad Morsi, when they ran into the former leader’s  supporters, one  of the boys’ father told Al Arabiya.
After both sides traded insults, the large group forced the boys to flee onto the building in Alexandria’s Sidi Jaber  area.
As the teenagers huddle on top of the 20ft ledge the mob begin throwing  rocks and larger items at them and attempt to climb after them.
A member of the aggressive roof-mob, a bearded man in a white top, is seen carrying a black-and-white al-Qaeda  flag.