Alton Towers is expected to be closed for a third full day today, as investigators continue to assess the cause of a rollercoaster crash in which 16 people were injured, four of them seriously.
A spokeswoman for the Staffordshire tourist attraction confirmed yesterday that there was an 11-minute gap between the incident and the time it took to phone 999, having previously said emergency services were "called immediately".
Alton Towers has been racking up losses of around £500,000 a day since closing.
The four people who suffered critical injuries were airlifted to major trauma centres after the 16 occupants were rescued from 25ft (7.6m) in the air at an angle of about 45 degrees.
The most seriously injured have been named as Daniel Thorpe, a 27-year-old hotel assistant manager from Buxton in Derbyshire, Vicky Balch, 19, from Leyland in Lancashire, textile design student Joe Pugh, 18, from Barnsley, South Yorkshire, and his girlfriend, Leah Washington, 17.
Mr Pugh tweeted that he had been "overwhelmed" by the support people had shown since the accident.
Some of the occupants suffered an ordeal which lasted more than four hours, with the evacuation not complete until 6.35pm.
Since opening two years ago, the £18 million rollercoaster, which boasts a world-record 14 loops, has been closed twice because of safety concerns.