query help

Hi,

I am trying to get new topic, edited topic and replies via program,however below works only for edited and new post and replies are not included please help.

 query.Query = "<Where><Geq><FieldRef Name='DiscussionLastUpdated'/><Value Type='DateTime'><Today IncludeTimeValue='TRUE' OffsetDays='-7'/></Value> </Geq></Where>";       

                   // query.RowLimit = 7;
                    string listUrl = web.ServerRelativeUrl + "/lists/Discussions";
                    SPList list = web.GetList(listUrl);
                    SPListItemCollection items = list.GetItems(query);
                    Console.WriteLine(items.Count);
                    foreach (SPListItem item in items)
                    {
                        Console.WriteLine("{0,-25}  {1,-20} {2}",
                           item["Discussions"], item["DiscussionLastUpdated"],item["ID"]);
                    }
                }
            }