NATO chief Anders Fogh Rasmussen has voiced concern about violence in Syria, but said the alliance has "no intention" of taking military action against the regime.

"We strongly condemn the behavior of the Syrian security forces and their crackdowns on the Syrian population and we urge the Syrian leadership to accommodate the legitimate aspirations of the Syrian people," he told a news  conference during an alliance summit in Chicago.

"But again NATO has no intention to intervene in Syria."