All motions (including motions for intervention), other than those made during a hearing, shall be made in writing to the Secretary of the panel, shall briefly state the relief sought, shall set forth the grounds for such motion, and shall be accompanied 3 days thereafter by proof of service on all parties. Answering statements, if any, must be served on all parties and the original thereof, together with two copies and statement of service, shall be filed with the Secretary within 5 days after service of the moving papers, unless the Secretary directs otherwise. Motions may be referred to the hearing officer whose ruling shall be made upon the record or the motion may be stayed until such time as the panel reviews the hearing officer's report and recommendations.