(Bloomberg) -- Italian divers have retrieved four bodies from a sunken yacht off Sicily, where British tech entrepreneur Mike Lynch and Morgan Stanley International chairman Jonathan Bloomer were among those feared to have died earlier this week. While four people were recovered, the local coast guard said Wednesday, no statements identifying them have been issued. A fifth body was spotted in the yacht but hasn’t yet been retrieved, an Italian government official said.

A total of six people likely were trapped and died inside the Bayesian when it was hit by a tornado near Porticello, Sicily, on Monday, according to authorities. The coast guard said operations would resume on Thursday morning to retrieve the remaining two missing people. Adding to the complexity of the search mission is the “narrowness of the spaces” inside the sunken yacht and “the presence of many objects,” the agency said.

Authorities are meanwhile investigating exactly how the luxury yacht sank — and why it sank so quickly — in the early hours of Monday morning, with the captain and other survivors answering questions from the local prosecutor’s office, according to a report from Italian news agency ANSA. The UK’s Marine Accident Investigation Branch said it’s also probing the incident, with questions surfacing around the expansiveness of the yacht’s mast and the state of the hull. “Right now there is no evidence that the mast has been snapped,” coast guard spokesman Vincenzo Zaga.