The United States has warned Beijing over reported use of Chinese weapons by insurgents in Iraq and Afghanistan as well as the Asian giant's continued sale of arms to Iran, Deputy Secretary of State John Negroponte said Thursday.

He said he conveyed the concerns personally to Chinese officials during his visit to Beijing this week.

"Just the other day, Monday, when I was in Beijing, this was one of the issues I raised -- concern about Chinese weapons or Chinese-designed weapons showing up in some of these battle areas, be it Iraq or Afghanistan," he told a congressional hearing on US-China ties.

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The US military in Iraq had said its troops had found Chinese-made missiles which they believe were smuggled in by groups in Iran aiming to arm militants fighting US-led forces.

The US military has repeatedly accused Iranian-linked groups of training Iraqi extremists in the use of armor-piercing weapons known as explosively-formed penetrators (EFPs).

Afghan authorities had also seized dozens of Iranian and Chinese-made weapons from Taliban fighters near the border with Iran.

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