US congressional leaders have agreed to a presidential request for up to $400 million in funding for covert operations against Iran, according to a report in the New Yorker magazine.

Previous cross-border operations have included the capture of Iranian security officers and the backing of anti-Tehran armed groups, said the report by Seymour Hersh, the investigative reporter.

The operations have been taking place since last year, the article said.

Bush's request, made through a Presidential Finding document, was approved by US congressional leaders, including Democrats, late last year, the report said.

Cross-border US operations against Iran include seizing members of the Iranian Revolutionary Guards and taking them across the border to Iraq for interrogation, the report said.

But the scale and the scope of the operations in Iran, which include the CIA, have now been significantly expanded, the New Yorker said, citing current and former officials.

Armed Sunni groups


Hersh says he believes the US is planning a possibe strike on Iran [GALLO/GETTY]
The operations also include providing support to armed Sunni Muslim groups opposed to the Iranian government, which is Shia.