Tensions in the Gulf sharpened again as the United States military said it struck radar installations along Iran's southern coastline, the latest confrontation to cast fresh doubt on a fragile ceasefire in the Middle East war. In a statement, US Central Command said its forces first brought down four Iranian one-way attack drones heading toward the Strait of Hormuz, then moved against Iranian coastal surveillance radar sites in the city of Goruk and on Qeshm Island. "The attack drones posed an immediate threat to regional…