As U.S. Secretary of State John Kerry sought to secure a pause in Yemen's war, Yemen sent a letter to the United Nations Security Council on Wednesday, urging the international community "to quickly intervene by land forces to save" the country, specifically in the cities of Aden and Taiz. The letter, sent to the president of the U.N. Security Council and obtained by The Associated Press and Reuters, calls on human rights organizations to document what Ambassador Khaled Alyemany calls the Houthis' "barbaric violations against a defenseless population." The Yemeni Foreign Minister Riyadh Yassin on Wednesday also read out the letter to Saudi King Salman bin Abdulaziz during a press conference aired on Al Arabiya News Channel. The letter said Yemenis were calling for a swift ground intervention to save Aden from falling to Houhti militias and added that the international community must protect civilians. Yassin also presented pictures which he said were evidence of Houthi crimes against Yemeni refugee families. The letter says more than 50 civilians, including women and children, were killed by Houthi strikes on their boats as they tried to flee Tawahi district. The letter claims that the Houthis are "targeting anything that moves" in Aden, killing humanitarian workers, using tanks and heavy artillery on families and preventing medical teams from reaching injured people. The spokeswoman for the current council president, Lithuanian Ambassador Raimonda Murmokaite, confirmed that the ambassador had received the new letter but said the council so far was not scheduled to discuss it on Thursday. The call for the use of ground forces comes as the international community instead calls for an immediate ceasefire, or at least humanitarian pauses, to deliver aid to civilians trapped in the fighting.