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
Please use Chrome browser for a more accessible video player
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.
North Sea crash: Solong ship unlikely to stay afloat but wasn’t carrying sodium cyanide, owners say
Oil tanker-freighter collision could have lethal ecological impact – it depends on these three things
Everything you need to know about North Sea cargo ship and tanker collision – as man arrested and missing sailor presumed dead
“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.”
Follow our channel and never miss an update.
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”.
This breaking news story is being updated and more details will be published shortly.
Please refresh the page for the fullest version.
You can receive breaking news alerts on a smartphone or tablet via the Sky News app. You can also follow us on WhatsApp and subscribe to our YouTube channel to keep up with the latest news.