Four survivors swam to shore and told authorities in Suriname the story of the attack, which the president of Guyana has called a "massacre."
Mohamed Farah and five other pirates shot at the USS Ashland in 2010.
Pirates have launched a string of attacks off Somalia’s coast.
The Sri Lankan-flagged ship disappeared on Monday after sending out a distress call.
There are 31 hostages currently being held by Abu Sayyaf.
The International Maritime Bureau said the waters off the southern Philippines have become increasingly dangerous.
Pirates are ramping up their activities off Nigeria's southern coast, according to a report.
Piracy in Nigeria has been on the rise since President Buhari took office.