ANYONE with evidence of government corruption or warmongering should come forward "before it's too late", several high-profile whistleblowers said yesterday.

Fifteen years ago today, the Observer revealed a US "dirty tricks" campaign to secure backing for the invasion of Iraq (which the paper nonetheless supported).

A leaked memo revealed surveillance operations by the US National Security Agency (NSA) and GCHQ, involving intercepting the telephone calls and emails of UN delegates before a crucial security council vote.