Dozens of US nuclear weapons stored at a Turkish air base near Syria are at risk of being captured by "terrorists or other hostile forces," a Washington think tank claimed Monday. Critics have long been alarmed by America's estimated stockpile of about 50 nuclear bombs at Incirlik in southern Turkey, just 70 miles (110 kilometers) from the border with war-torn Syria. The issue took on fresh urgency last month following the attempted coup in Turkey, in which the base's Turkish commander was arrested on suspicion of complicity in the plot.