The U.K. will no longer have access to multiple databases critical for combating transnational crime and terrorism after January 1 because it has thus far failed to come to a Brexit agreement with European security agencies and regulators on the use of collected data.

The situation, according to EU intelligence officials, will force security officials on both sides of the channel to work much harder and less efficiently to check names, passports, travel history, criminal records, and other investigative tools to track suspects moving around Europe and between the EU and the United Kingdom.

“The Schengen system alone is accessed over 500 million times a year by U.K. officials, but tomorrow the daily average of 1.6 million requests for information will stop and U.K. officials will be forced to collect all the information from other sources,” said a senior Belgian counter-terrorism official, whose service does not allow them to speak openly to the media.

“This information can certainly be found but the point of these systems and databases is speed and proper managing of huge streams of information.”