What are the requirements for UN media accreditation?

A letter of assignment on the letterhead of a bona fide media organization, signed and dated by the Editor-in-Chief or an authorized person, stating the name and function of the applicant. The letter should specify what story/event the applicant will cover and the desired time period for the press pass. Copies of the applicant's press card and passport (or national ID for Swiss citizens) must also be supplied. Additional criteria are required for online media.