Executioner:
Dressed in camouflage uniform, the young boy, who appears to be no
older than 10, takes aim at Mr Musallam (left). He then raises his arm
in celebration (right) as Mr Musallam lies bleeding on the ground
Brutal: While
ISIS claim the child - described in the video as one of the 'cubs of the
caliphate' - was the shooter, careful editing means it is impossible to
tell whether he pulled the trigger (above)
Featuring
graphics, re-enactments and a number of camera angles, the film also
includes a number of camera effects and cut-away shots that give it a
'computer game' look.
It
starts with an animated 'fact file' of Mr Musallam - complete with what
appears to be a picture of the inside of his passport - that claims to
show his home address and profession.
Speaking
in Arabic, the young man tells of how he was recruited by a neighbour
who worked for the Israeli police. The entire video is subtitled in
English.
He is seen wearing an orange jumpsuit similar to those warn by other men taken hostage by ISIS.
Mr
Musallam remains calm and controlled as he explains that he was
approached by an Israeli neighbour who asked him to work for Israeli
intelligence.
He
says that his father and brother both encouraged him to take up the
position, pointing out there would be opportunity to progress in the
organisation.
Sickening: Mr Musallam appears to be shot three more times as he lies dying on the ground
Earlier
today, Twitter accounts linked to the terror group shared preview clips
of the video, which has not been independently verified.
Islamic
State claimed Mr Musallam had posed as a foreign fighter when he joined
their ranks last year but later confessed to being an agent for Mossad,
the Israeli intelligence agency.
The
accusation has been denied by an Israeli security official and by his
parents - who claimed he had travelled to the region to fight alongside
the jihadists.
The
video, published today by the group's Furqan media outlet, is the
latest in a series of propaganda videos that purportedly show the
execution of ISIS hostages, including three Britons.
It
also lists the names of 13 other men - including Mr Musallam's elder
brother and father - who the group claims are working for Mossad.
Sickening: The young boy, who appears to be no older than 10, leads Mr Musallam into the field
Harrowing: The footage shows the 19-year-old prisoner just moments before he is shot in the head, pictured
Slick: In the first part of the video, Mr Musallam is seen describing how he was recruited by Israeli intelligence
He adds: 'I knew at that point they themselves were working as spies'.
Mr
Musallam goes on to describe how he was trained to use weapons and
withstand interrogation techniques at a camp in Jerusalem before being
sent to Syria on a mission.
He
explains he was told to infiltrate the Islamic State and send
information on weapon stores, training bases and Palestinian members of
the group back to Israel.
In
what appears to be a rehearsed speech, Mr Musallam talks about how he
entered Turkey before being smuggled across the border to Islamic
State-occupied Syria.
He
shares of how he was caught and interrogated by jihadists after they
became suspicious when he left a guest house where he was staying to
make a phone call to his father.