An Italian judge has ordered 26 US citizens - most of them CIA agents - to stand trial over the kidnap of an Egyptian cleric in Milan in 2003.

Osama Mustafa Hassan was allegedly seized by the CIA and flown to Egypt, where he says he was tortured.

Seven Italians were also indicted, including Italy's ex-military intelligence chief, Nicolo Pollari.

The case would be the first criminal trial over the secret US practice known as "extraordinary rendition".

During rendition, people suspected of involvement in terror activities are taken from one country and flown to another, where many claim they are tortured.