Updated

Seychelles police say a mixture of heroin and alcohol caused the deaths of two former U.S. Navy SEALs.

A police statement Tuesday quoted by the government-funded Seychelles News Agency said toxicology analysis found no poison in the men's blood. The police said previously the men died of respiratory failure and were suspected to have had heart attacks.

The two Americans — Mark Daniel Kennedy, 43, and Jeffrey Keith Reynolds, 44 — were security contractors providing anti-piracy services for the Virginia Beach, Virginia-based maritime security firm The Trident Group.

The two were found dead Feb. 18 aboard the Maersk Alabama, a ship famous because Somali pirates hijacked it in 2009. Navy SEALs shot and killed three pirates to free the ship in an incident depicted in a movie starring Tom Hanks.