An Ohio couple have been found dead in an apparent murder-suicide in their stateroom aboard a Holland America cruise ship docked in Puerto Rico. The unidentified man and woman were in their 50s and from Cleveland, police Sgt. Ricardo Cruz told The Associated Press. Cruz said blood was found in the cabin aboard the MS Ryndam, but it was unclear how the couple died. A team of FBI investigators boarded the MS Ryndam after a Cleveland couple were found dead in an apparent murder-suicide as the ship docked in San Juan, Puerto Rico . The bodies were taken off the ship Thursday night by a team of FBI crime scene investigators. Authorities will not say how the couple died . The cruise is expected to get back underway on Friday as it heads to the Virgin Islands . 'We don't know yet whether an object was used or what the motive was,' he said. He said the ship's cleaning crew found the bodies when they checked on the couple after not seeing them for a while. The FBI has taken over the investigation. It was unclear exactly when the couple died. The ship departed Tampa, Florida, on Sunday for a two-week cruise in the southern Caribbean. It stopped in Key West on Monday and then spent two days at sea before docking in historic Old San Juan on Thursday, Holland America spokesman Erik Elvejord said. Passengers say they had no idea of what had happened - only that they had to wait a long time to disembark from the ship . Passengers were horrified when they learned what had happened in a stateroom aboard the ship . 'We are terribly saddened by this tragic event,' the company said in a statement. Cruise ship passengers said they were not aware of what had happened. 'This is a shock to me,' said Mark Moore of Watertown, New York, who was traveling with his wife. He said the crew had roped off part of the ship and hung a sheet in the hallway as passengers disembarked around noon. Other baffled passengers said they were never told what happened aboard the ship - only that there was a big holdup as they tried to disembark when the ship docked at San Jaun, according to WAPA-TV. Then, a large team of FBI crime scene technicians arrived, along with local police and other FBI agents. The Ryndam was scheduled to depart Puerto Rico late Thursday and arrive in St. Thomas on Friday.
The couple are in their 50s and from Cleveland, Ohio .
Ship with 1,500 passengers aboard left Tampa, Florida, for a two-week Caribbean cruise on Sunday .
The bodies were discovered Thursday when crew members checked on the couple in their stateroom .