Lloyd's chairman Saxon Riley has warned against specific estimates of the absolute financial cost for the World Trade Cantre tragedy.
"The situation in New York and Washington is evolving continually. The global social and economic effects are only just starting to be felt. Any caclculation of the total losses so soon after the event can only be deeply flawed," he said.
The world's largest insurers and reinsurers are starting to estimate costs to their businesses and releasing the figures.
But Riley warned Lloyd's was a complex market made up of over 100 companies and analysis of losses is complex. He added the market would not release any aggregate figure until it had more detailed information.