Downing Street said the prime minister believed an inquiry now into the outrage which killed at least 49 people would be a "ludicrous diversion."
Instead, in a statement to the Commons on Monday following last week's Group of Eight summit, Mr Blair is expected to focus on the direction the government must take to ensure future terrorism is defeated.
He is expected to tell his counterparts governments must ensure operators keep data on telephone and internet exchanges for up to a year.
Financial Times article
James Blitz and Jimmy Burns, reposted by someone somewhere