A protester wears a mask made from a leaf in the Cibitoke neighborhood of Bujumbura, Burundi, on May 5, 2015. Protesters in Burundi dismissed a constitutional court ruling that cleared President Pierre Nkurunziza to run for a controversial third term, as the government offered to release activists if deadly demonstrations stopped. #

A man climbs atop a giant 'Mother of the Motherland' monument, decorated with a symbolic wreath of red poppies, at the Museum of the Great Patriotic War in Kiev, Ukraine, on May 8, 2015. #

A policeman holds a water bottle with a yellow-crested cockatoo put inside for illegal trade, at the customs office of Tanjung Perak port in Surabaya, East Java province, Indonesia, on May 4, 2015. Police arrested one man traveling by ship from Makassar, Sulawesi with 22 of the endangered cockatoos held inside water bottles. #

The spilt-second a concussion grenade thrown by Israeli soldiers explodes between the feet of Palestinian journalists following a protest ahead of the World Press Freedom Day at the main entrance of the West Bank town of Bethlehem, on May 2, 2015. #

Local youngsters Bella (left) and Daisy walk through a forest floor covered in bluebells near Marlborough in southern England, on May 4, 2015. The Savernake Forest and West Woods, managed by the Forestry Commission and replanted in the 1930's to 1950's with beech trees, provide one of the most spectacular sites in Britain for seeing bluebells at this time of year. #

U.S. Secretary of State John Kerry takes a selfie with a baby elephant while touring the Sheldrick Center Elephant Orphanage at the Nairobi National Park, in Nairobi, Kenya, on May 3, 2015. #

Beachgoers are hit by a wave in La Libertad, El Salvador, on May 3, 2015. Emergency authorities declared a green alert along the Pacific coast due to a large swell that affected the Salvadoran coast, originating from extra-tropical storms that formed in New Zealand and the Southern hemisphere, according to El Salvador's ministry of environment and natural resources. #

A 'Maya' girl sits on an altar during the traditional celebration of 'Las Mayas' on the streets in Colmenar Viejo, near Madrid, Spain, on May 2, 2015. The festivity of the Maya comes from pagan rites and dates from the medieval age, appearing in ancient documents. It takes place every year in the beginning of May and celebrates the beginning of the spring. Girls between 7 and 11 years old are chosen as 'Maya' and sit still, serious and quiet for a couple of hours in altars on the street decorated with flowers and plants. Afterwards they walk to the church with their family where they attend a ceremony. #

A Netherlands helicopter participates in NATO's Dynamic Mongoose anti-submarine exercise in the North Sea off the coast of Norway, on May 4, 2015. NATO launched one of its biggest-ever anti-submarine exercises in the North Sea on Monday, inviting non-member Sweden for the first time, amid increasing tensions between Russia and its northern neighbors. #

An exiled Tibetan woman prays on the occasion of the Buddha Jayanti festival in New Delhi, India, on May 4, 2015. The festival marks Buddha's birth, enlightenment and death. #

Ultra-Orthodox Jewish men dance around a bonfire in Jerusalem on May 6, 2015, during the Lag Ba'Omer holiday, marking the end of a plague said to have decimated Jews during the Roman times. #

The Los Angeles Aqueduct Cascades are seen in Sylmar, California, on May 4, 2015. The aqueducts bring water 223 miles from the Owens River in the eastern Sierra Nevada mountains, and 137 miles from the Haiwee Reservoir, and are a major source of water for Los Angeles. California's snowpack, which generally provides about a third of the state's water, is at its lowest level on record. #

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave the Lindo Wing of St Mary's Hospital with their newborn daughter, Princess Charlotte Elizabeth Diana, on May 2, 2015, in London, England. #

A worker walks through farm fields in Los Banos, California, on May 5, 2015. California water regulators on Tuesday adopted the state's first rules for mandatory cutbacks in urban water use as the region's catastrophic drought enters its fourth year. #

People take part in a candlelight vigil to to pay tribute to the earthquake victims after the April 25 earthquake, at Boudha Stupa in Kathmandu, Nepal, on May 7, 2015. #

A young woman offers a flower to police officers blocking the street at the Government building in Skopje, Macedonia, on May 6, 2015. More than 1,000 opposition supporters protested peacefully outside Macedonia's parliament on Wednesday over the 2011 police killing of a student, a day after violence at a similar demonstration left 38 police officers and one protester injured. #

Smoke and fire erupt from an oil train that derailed on May 6, 2015, in Heimdal, North Dakota, Officials say 10 tanker cars on the BNSF caught fire prompting the evacuation of Heimdal where about three dozen people live. No injuries were reported. #

42 year old Ridwan Sururi prepares books while a boy selects a book at the mobile library on May 5, 2015 in Serang Village, Purbalingga, Central Java, Indonesia. Ridwan, a horse caretaker from Serang Village, started the mobile library using a horse named "Kudapustaka" in January of 2015 with book donations from his friend Nirwan Arsuka and other donors. Every week on Tuesday, Wednesday and Thursday he visits nearby schools to offer books to children. #

Pedestrians pay for piggy-back rides across flooded Morogoro Road in Dar es Salaam, Tanzania, on May 7, 2015. The Tanzania Meteorological Agency warned of 50mm of rainfall on May 6 and 7 due to a low pressure system developing in the Indian Ocean. #

Italian astronaut Samantha Cristoforetti sips espresso from a cup designed for use in zero-gravity, on the International Space Station on May 3, 2015. Cristoforetti, the first Italian woman in space, fired up the first espresso machine in space, which uses small capsules, or pods, of espresso coffee. #

Reservoir banks that used to be underwater line Millerton Lake, on the San Joaquin River, in Friant, California, on May 6, 2015. California water regulators on Tuesday adopted the state's first rules for mandatory cutbacks in urban water use as the region's catastrophic drought enters its fourth year. #

An aerial view shows the car that was used the previous night by two gunmen, who were killed by police, as it is investigated by local police and the FBI in Garland, Texas, on May 4, 2015. Texas police shot dead two gunmen who opened fire on Sunday outside an exhibit of caricatures of the Prophet Mohammad that was organized by a group described as anti-Islamic and billed as a free-speech event. #

A man looks out from his shack as a luxury high-rise apartment complex is seen in the background at Guryong village in Seoul, South Korea, on April 2, 2015. Demolition of Guryong, the last slum in Seoul's glitzy Gangnam district, is expected to start this summer after redevelopment plans were mired for years in squabbling among the city, district and developers, and even battling residents. #

Russian Defence Minister Sergei Shoigu salutes during a rehearsal for the Victory Day parade in Red Square in central Moscow, Russia, on May 7, 2015. Russia will celebrate the 70th anniversary of the victory over Nazi Germany in World War Two on May 9. #