The tape, then shows the two men rush to the body. One appears to be
slitting the victim's throat.
The two assailants, who are also dressed in Western clothes,
are only ever shown from the shoulder down.
The killing takes place in the covered yard of a residential
building where a four-wheel-drive vehicle is parked in a garage
space. After the killing, the tape says: "Voice of Jihad -
expel the infidels from the Arabian Peninsula."
The footage is attributed to an al-Qaeda terror cell which
claimed responsibility for the killing.
The video described the victim as "American Jew Robert
Jacob, who worked for the spy group Vinnell".
Mr Jacob, 44, who worked for the US Vinnell Corp, which helps
train the Saudi National Guard, was shot dead at his home in
Riyadh last Tuesday. He was reportedly shot nine times in the
Yesterday, an al-Qaeda cell said it had killed a US national in
a drive-by shooting and kidnapped another American in the Saudi
capital amid a bloody campaign by the network to drive Western
"infidels" out of the kingdom.