MOSCOW, April 19 (RIA Novosti) - There are about 40 Russian-language websites with terrorist and extremist content on the Internet, a senior law enforcement official said Wednesday.

"A quarter of these have been registered through Russian service providers," Boris Miroshnikov, head of the Interior Ministry department for high-tech crime, told an international conference on cybercrime and cyberterrorism.

Miroshnikov said last year had seen some 15,000 high-tech crimes, including 10,000 related to computers. He added that more than 450 cases of computer fraud had been registered in 2005, and that this form of crime was likely to increase.

The official said the Interior Ministry proposed revising and expanding the European Convention on Cybercrime, signed by 42 countries in 2002. The convention has been ratified by 12 states, including only one from the Group of Eight industrialized nations.