Foreign Minister Murray McCully says the Opposition will be offered a formal briefing on Syria before any parliamentary motion is put by the Government.
"There will be a point in the coming week where it will be appropriate,'' he told reporters in the Marshall Islands where he is attending the Pacific Islands Forum.
Labour foreign affairs spokesman Phil Goff called for more information in the wake of a request from the United States for New Zealand to lend moral support to a military strike against the Syrian Government in response to chemical warfare attacks on civilians.
Mr McCully said there was a growing body of evidence, added to by France overnight, as to the use of chemical weapons and who was responsible.
"To the extent there is any private information about that from partners, all I can say is it simply adds further weight to what's in the public arena.''