POLICE officers were carrying out a search last night in North Harbour.
A van and four police cars were parked in Western Road from about 8pm and were searching the area for a person.
Police dogs were let off their leads.
Firefighters from Cosham were called out at about 10.15pm to help the search with a thermal camera.
Workers at Lakeside 1000 were being escorted to their cars at about 11pm. A spokeswoman for Hampshire police said there was no danger to the public and would not provide any further details.