Brussels: NATO is calling for a "prompt, impartial, credible and transparent investigation" into the Israeli raid on an aid flotilla that ended with the deaths of nine activists.

Representatives of the alliance's 28 nations met on Tuesday to discuss the incident. Secretary General Anders Fogh Rasmussen demanded the immediate release of the detained civilians and ships held by Israel.

Turkey called the emergency meeting, but its representative did not demand that the alliance take collective action against Israel, said a diplomat who attended the talks. The official asked not to be named because of the sensitivity of the matter.

NATO, of which Turkey is a long-standing member, has reacted cautiously to the events. The alliance cooperates with Israel on anti-terrorism patrols in the Mediterranean.