Not able to pull more than 100 comments per post

Question

We are trying to get the data from facebook. When trying to get all the comments using the fql query facebook is returning less than 100 comments per post.

Following is the fql query used.

SELECT text,id 
FROM comment 
WHERE post_id in (select post_id from stream where source_id=**** and actor_id = ****)

also tried

SELECT text,id FROM comment WHERE post_id = ****

Please help me solve the problem. Thanks in advance

note : both source_id and actor_id are same. and post_is mentioned has more than 100 comments (180) and is returning only 99 comments