Police are facing a bill for almost £100m for damage to the Yarl's Wood immigration detention centre from a security firm and insurers. The sum has doubled since initial estimates put it at £43m.
The revised figure, of just under £97m, includes an estimate of uninsured losses as well as insured losses.
Yarl's Wood was devastated by fire and riot when detainees ran amok on 14 February.
The claim was made under the 1886 Riot Damages Act by Group 4, the private security firm which runs the Bedfordshire centre.
It includes a sum claimed by the centre's insurers, the DJ Pye syndicate 962 of Lloyd's and the cost of business interruption.
DJ Pye has not had access to the site and claims manager Peter May said the estimates used to calculate the claim could change.
"We looked at what it cost to build and extrapolated from how much of the building was damaged. But we can't get in yet, and necessarily it's an estimate.
"If the site is released by the police we could look at the value of the claim and could revisit the estimates."
Bedfordshire Police Authority has indicated it will resist the claim.
