have been put up outside a police station in Derry/Londonderry to protect the site from potential republican attacks, it has been reported.
A steel barrier has also been placed at parking spaces close to the station in Strand Road, the BBC said.
District commander chief superintendent Stephen Martin told the BBC the move was "the correct, necessary and proportionate thing to do" and was in response to what it dubbed a "severe threat".
"We have talked to a number of people including local residents, the Chamber of Commerce and the City Centre Initiative to explain our reasons for taking this step, and the matter will be kept under review," he also told the BBC.
This month, a man was charged in connection with a bomb attack on the Strand Road station in August, the news provider said.
The 22-year-old, who is from the Derry area, faces charges including causing an explosion, hijacking and false imprisonment.