International aid arrived in Sana'a, Yemen, after a three-week-long Saudi-led blockade cut off UN aid workers, UNICEF volunteers and the Red Cross from the crisis-hit country, Saturday. The blockade followed an intercepted missile attack on Riyadh, which Yemen's Houthi movement claimed responsibility for. «Sana'a International Airport received two UNICEF flights carrying polio vaccines and... Еще another Red Cross flight with 8 Red Cross staff,» the capital city's airport director Khalid Al-Shayef explained. Over 7 million people in Yemen are struggling to cope with famine and disease which is ravaging civilian populations reliant on aid from international organisations. Most recently, the World Health Organisation (WHO) issued a warning that cases of Diphtheria in the war-torn country are on the rise.