Delegates from 20 countries worked on simulated exercises tackling the threat of electronic extortion over the Internet.
The exercises were designed by Neil Barrett, technical director of security firm IRM. He said, "We built a few scenarios to see how crime is investigated internationally but a key objective is to make the UK safe for e-business."
Bob Packham, deputy director-general of the National Crime Squad, said, "High-tech Internet crime knows no boundaries, so close and effective working between law enforcement agencies is crucial, as is close working and co-operation between industry and commerce."
Andy Williams, senior marketing manager at the squad's IT partner Serco, said, "This is about bringing the skills of both police and industry together whilst leaving the police to policing."
The £25m National High-Tech Crime Unit is due to be operational in April.