WASHINGTON, Aug 12, SPA -- New York city police increased security throughout Manhattan and at bridges and tunnels in response to what they called an "unverified radiological threat."But they said the city's alert status for an attack was unchanged at "orange." The New York Police Department said in a statement it had increased the deployment of radiological sensors on vehicles, boats and helicopters and had set up vehicle checkpoints in lower Manhattan and at bridges and tunnels.--SPA www.spa.gov.sa/474443