At least five people have died and four are missing after a container ship crashed into a control tower in the Italian port of Genoa, officials say.
The Jolly Nero smashed into the concrete and glass tower late at night, reducing it to rubble.
Three people were reported to have been trapped inside a lift that fell into the water as the tower collapsed.
Rescue workers have been searching in the rubble for survivors while divers scoured the water around the dock.
The accident occurred at about 23:00 on Tuesday night (21:00 GMT), when a shift change was taking place in the control tower and as many as 14 people were inside.
The ship was manoeuvring out of the port with the help of tugboats in calm conditions, on its way to Naples, reports said.
‘Utterly shocked’
The cause of the crash was not immediately clear, but Genoa’s Il Secolo XIX newspaper quoted the Jolly Nero’s captain as saying that two engines appeared to have failed and “we lost control of the ship”.
The head of the Genoa Port Authority, Luigi Merlo, told the newspaper: “It’s very difficult to explain how this could have happened because the ship should not have been where it was.”
The ship’s owner, Stefano Messina, who arrived at the port soon after the crash, had tears in his eyes as he told journalists: “We are all utterly shocked. Nothing like this has ever happened before, we are desperate.”
“It’s a terrible tragedy. We’re in turmoil, speechless,” Port Authority President Luigi Merlo told local TV.
All that was left of the control tower after the crash was a buckled metal exterior staircase.
“It was an incredible sight: the control tower was leaning perilously,” the port’s nightwatchman told La Repubblica newspaper.
Three of the victims were coast guard or port workers in their early 30s, while the other bodies had yet to be identified. Coast guard officials raised the death toll to seven on Wednesday, before lowering it to five.
Genoa’s prosecutor is investigating the incident, Corriere Della Sera newspaper says. The ship has been impounded and the captain is being questioned.
The Jolly Nero is almost 240 metres (787 feet) long and has a gross tonnage of nearly 40,600 tonnes. It is owned by the Italian firm Ignazio Messina & Co.
The crash revived memories of the crash involving the Costa Concordia cruise ship off the Italian island of Giglio in January 2012, which left 32 people dead.