Police Friday arrested two suspected militants and seized 450 kilograms (990 pounds) of explosive material in a raid in Southern Karachi port city, said a police official. Police in a raid on a house in Magopir area found 325 kilos of sodium nitrate, 100 kilos of potassium and other high-intensity bomb-making material, city police chief, Niaz Siddiki, told reporters. He said two suspected militants were also arrested, adding that police was interrogating them to determine their links with any outlawed outfit. He said they originally belong to North-West Frontier Province (NWFP) and had been selling bomb-making material to terrorists since last four years.