Police have made their first arrest based on facial recognition technology, a system that is controversial but could identify terrorism suspects in real time. South Wales police said that they arrested a local man with an outstanding warrant last week after cameras identified him from his features as he passed a surveillance van. The arrest came as officers were preparing to use cameras fitted on vehicles to film the faces of football fans attending the Champions League final at the Millennium stadium in Cardiff on Saturday. The force has received Home Office funding to pilot the technology from the NEC security business. Success could lead to a national rollout.