Philippine officials say immigration agents have arrested 277 Chinese in a raid against an online investment scam syndicate that has defrauded victims in mainland China.Immigration Commissioner Jaime Morente said the arrests on Wednesday in the Ortigas financial district in Pasig city in the Manila metropolis came after the Chinese embassy provided information about the investment fraud, which has victimised more than 1,000 Chinese nationals. The raid was coordinated with China.Morente said on…