The company in charge of a fleet of amphibious tour buses hassaid it was working closely with investigators after one of its vessels sank, with 33 people on board having to swim to safety or be rescued.
A number of people were taken to hospital after the Yellow Duckmarine bus went under just before 4pm on Saturday in Liverpool’s Albert Dock.
A “multi-agency investigation” led by the Marine Accident Investigation Branch (MAIB) has been launched into the sinking the second in three months.
A company spokesman said: “The MCA has confirmed that Yellow Duck’s active fleet meets all required safety standards.”
The spokesman confirmed that the rest of the fleet would remain grounded until further notice from the MCA.
A rescue operation involving police, ambulance, coastguard and the RAF was mounted by the emergency services and 31 people, along with two crew members, were helped out of the water.
Of those, 18 people were taken to the Royal Liverpool Hospital for treatment, mostly for shock, but all were well enough to be discharged.
Some 28 people were led to safety from the vessel, including a baby whose mother held her above the water on the roof of the sinking craft.
Three more were saved from the water by firefighters. Nobody was trapped inside the vessel.