There is growing pressure for more details about the use of facial recognition in London's King's Cross to be disclosed after a watchdog described the deployment as "alarming". Developer Argent has confirmed it uses the technology to "ensure public safety" but did not reveal any details. It raises the issue of how private land used by the public is monitored. The UK's biometrics commissioner said the government needed to update the laws surrounding the technology. Argent is responsible for a 67-acre site close to King's Cross station.