Tech industry, military tactics and police meet at Urban Shield weapons expo

In its 10th year, the 'warfare expo' attracts SWAT teams from several police departments, including the University of California and Mexico's federal police

Amid a startling array of weaponry and defensive gear, several exhibitors at Urban Shield, the annual northern California police exhibition, were displaying robots similar to the model that was used to kill the gunman who fatally shot five Dallas officers in July.

"You could do the same thing with our robot," said Dan Murphy of ICOR Technology. Dallas police reportedly placed a pound of C4 explosives and a detonation device on the robot in what is believed to be the first time in history that a US law enforcement agency used a robot to kill a suspect.