Sudan's independence referendum

Students are reflected in the window of a classroom where South Sudanese wait in line to cast their vote at a polling station in Juba Photograph: Jerome Delay/AP

A mother and daughter register at a polling station during the second day of voting for the independence referendum in Juba, Sudan Photograph: Spencer Platt/Getty Images

A Sudanese journalist Liza Taban takes notes in a school turned into a polling centre in Khartoum Photograph: Khaled Desouki/AFP/Getty Images

A Southern Sudanese woman buys drinking water from a travelling vendor at a bus station while waiting for transportation to her home in the suburb of Mandela on the outskirts of the capital Khartoum Photograph: Nasser Nasser/AP

A mother and her daughter walk to a polling station in Juba, Southern Sudan Photograph: Spencer Platt/Getty Images

A polling staff member talks on his mobile while taking a break at a polling centre in Khartoum Photograph: Nasser Nasser/AP

A poster of Salva Kiir Mayardit, acting President of the government of Southern Sudan in Juba, Sudan Photograph: Spencer Platt/Getty Images

Daniel Chol, two, looks around as his mother, Josephena Thal, left, of Phoenix, prepares her ballot in a referendum vote on whether South Sudan will become independent from Sudan at St James Catholic Church in Glendale, Arizona. The polling station is one of eight in the country Photograph: David Wallace/AP