Information Minister Dorria Sharafedin has paid tribute to the role played by policemen in countering violence and terrorism nationwide.In a symposium held at the Police Academy in New Cairo suburb on Tuesday, the minister mourned police martyrs who fell victims for the sake of the country's security and stability.The seminar was held under the auspices of Interior Minister Mohamed Ibrahim under the theme "Media & Security..Evaluation of Media Coverage of Security Issues..Impact of Talk Shows on Security."