Philippine officials are alarmed by the surge of Chinese nationals in Cagayan, a province at the northern tip of Luzon island facing Taiwan, describing it as a creeping invasion that has prompted government security forces to investigate.Some 4,600 Chinese nationals have been recorded to be living in the Cagayan area and enrolled in private universities in the city of Tuguegarao. There are three new sites in the region under the Enhanced Defence Cooperation Agreement (EDCA), a pact with the United States which allows for large-scale joint military exercises.Citing security concerns, Philippine military spokeswoman Colonel Francel Margareth Padilla on Tuesday said...