UNICEF representative in Yemen Julien Harneis visits a vaccination storage centre at the Ministry of Health in Sanaa May 27, 2015. Due to power and fuel shortage in the country, UNICEF helps to provide fuel to the ministry to refrigerate the $30-million vaccines in appropriate conditions. Health services in Yemen are on the brink of collapse amid critical shortages of life-saving medicines, oxygen and fuel, the World Health Organization (WHO) said last week. REUTERS/Mohamed al-Sayaghi