A man has been arrested on suspicion of gross negligence manslaughter in connection with the ship collision in the North Sea.
Humberside Police said the 59-year-old is in custody to allow enquiries to take place, and officers are talking to those involved to find out what happened.
Investigators have started a criminal investigation into the cause of the collision between the Stena Immaculate and Solong off the coast of East Yorkshire on Monday and are working with the Maritime and Coastguard Agency, the force added.
One person remains missing and presumed dead after emergency services stopped their search on Monday evening.
The Marine Accident Investigation Branch is also involved in early work to determine what caused the two vessels to collide.
Read more: What we know about the collision
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Senior Investigating Officer, Detective Chief Superintendent Craig Nicholson said: “Humberside Police have taken primacy for the investigation of any potential criminal offences which arise from the collision between the two vessels.
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“Extensive work has already been carried out, and we are working closely with our partners to understand what happened, and to provide support to all of those affected.
“Following enquiries undertaken by my team, we have arrested a 59-year-old man on suspicion of gross negligence manslaughter in connection with the collision, this follows the conclusion of search operations by HM Coastguard for the missing crew member of the SOLONG.
“Our thoughts are with the family of the missing crew member, and I have appointed Family Liaison Officers to make contact and provide support to the family.
“The man arrested remains in custody at this time whilst enquiries are under way, and we continue speaking with all those involved to establish the full circumstances of the incident.”
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It comes after Transport Minister Mike Kane told MPs that the Solong is expected to sink, and that the Maritime and Coastguard Agency is “working at pace to determine exactly what cargo the Solong is carrying”.
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