Pirates opened fire on a Dutch cargo ship a few miles from the Nigeria’s Port Harcourt, kidnapping the ship’s master and an engineer and stealing cash, a security source and anti-piracy group AKE said on Wednesday. An AKE statement said the ship, a “Dutch-owned, Curacao-flagged refrigerated cargo vessel”, was attacked on Tuesday around 4.10 p.m. (1510 GMT), the latest in a string of pirate attacks in the oil-exporting Gulf of…