( CNN ) -- Autopsy results indicate two American security officers found dead on the container ship Maersk Alabama last week died of respiratory failure , coupled with a suspected heart attack , police in the Seychelles said Tuesday . Further forensic analysis will be carried out to establish if the two men , Jeffrey Reynolds and Mark Kennedy , had consumed a substance that may have brought on these events , a police statement said . Traces of narcotics were found with the bodies of the officers , it said . `` The police preliminary investigation report includes suspicion of drug use , as indicated by the presence of a syringe and traces of heroin which were found in the cabin , '' the statement said . The two men , both 44 , worked for Trident Group , a Virginia-based maritime security services firm . Trident Group President Tom Rothrauff said both were former Navy SEALs . The 500-foot Maersk Alabama was the target of an attempted hijacking in the pirate-infested waters off East Africa in 2009 -- an incident that inspired the 2013 film `` Captain Phillips . '' The shipping giant Maersk , which hired the Trident Group to guard its ships , said last week that Trident would be conducting random drug tests of its employees . `` Based on our experience with the contractor , this is an isolated incident , '' Maersk said . But it said new drug tests would start immediately and the company 's shore leave policy was under review . Police said the ship arrived on February 16 in the Seychelles , an archipelago in the Indian Ocean , with a 24-man crew and had been expected to leave two days later . The bodies were found last Tuesday by a colleague who had gone to check in with one of the men in a cabin , Seychelles police said . The Maersk Alabama has since left the Seychelles capital of Port Victoria .
Autopsy reports on two U.S. security officers indicate they died of respiratory failure . They may also have suffered heart attacks , a police statement says . The bodies of the two men were found a week ago on the container ship Maersk Alabama . Police report `` includes suspicion of drug use '' as syringe , traces of heroin were found .