Chinese paramilitary policemen stand guard as a line of air portable armored fighting vehicles waiting to take part in rehearsals ahead of the Sept. 3 military parade to commemorate the end of World War II in Beijing, Saturday, Aug. 22, 2015 (AP)

Syrian refugee children scream as they are siting in front of Macedonian riot police at the Greek-Macedonian border, near the village of Idomeni, August 21, 2015 (Reuters)

In this photo taken Tuesday, July 28, 2015 (AP)

A station officer waist for trains to arrive on the platform of a subway station in Pyongyang, North Korea, Saturday, Aug. 22, 2015 (AP)

A view of a landslide along Kennon Road after Typhoon Goni battered Baguio city in northern Philippines August 22, 2015 (Reuters)

Performers participate in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015 (Reuters)

Adrian Valles of Spain competes in the men's pole vault qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015 (Reuters)

A British soldier keep watches at the site of a blast in Kabul, Afghanistan August 22, 2015 (Reuters)

Ukraine's President Petro Poroshenko (L) attends a ceremony to hand over new weapons and military vehicles to servicemen of the Ukrainian armed forces at an air base in Chuhuiv, Kharkiv region, Ukraine, August 22, 2015 (Reuters)

FILE - In this July 17, 2015, file photo, President Barack Obama meets with Emma Didlake, 110, of Detroit, the oldest known World War II veteran, in the Oval Office of the White House in Washington. The Michigan woman who was believed to be the nation's oldest veteran has died a month after meeting the president. The Oakland County medical examiner's office says Didlake died Sunday, Aug. 16 in West Bloomfield, northwest of Detroit. (AP)

A Syrian refugee prays on a rail track at the Greek-Macedonian border, near the village of Idomeni, August 22, 2015 (Reuters)

A devotee of river goddess Osun performs a ritual during the annual Osun-Osogbo festival in honour of her in Osogbo, Nigeria, in this August 21, 2015 (Reuters)

A woman hugs two boys after crossing Greece's border into Macedonia near Gevgelija, Macedonia, August 22, 2015 (Reuters)

The Cotopaxi volcano, one of the world's highest active volcanoes, spews ash and smoke as seen from Quito, Ecuador, August 22, 2015 (Reuters)