People climb flag poles flying Yemen's national flag during a ceremony marking Yemen's Reunification Day, in Sanaa, May 22 ,2016 (Reuters)

Boys climb a gate of an abandoned garment factory as they watch a gathering of tribesmen loyal to the Houthi movement in Sanaa, Yemen, May 19, 2016 (Reuters)

Horses take part in a march during a ceremony marking Yemen's Reunification Day, in Sanaa, May 21, 2016 (Reuters)

People wave Yemen's national flag during a ceremony marking Yemen's Reunification Day in Sanaa, May 22 ,2016 (Reuters)

Tribesmen loyal to the Houthi hold their rifles during a gathering to show support to the movement in Sanaa, Yemen, May 19, 2016

A military band takes part in a march during a ceremony marking Yemen's Reunification Day, in Sanaa, May 21, 2016 (Reuters)

Horses take part in a march during a ceremony marking Yemen's Reunification Day, in Sanaa, May 21 ,2016 (Reuters)

People attend a ceremony marking Yemen's Reunification Day in Sanaa, May 22 ,2016 (Reuters)

Tribesmen loyal to the Houthi movement perform the Baraa dance during a gathering to show support to the movement in Sanaa, Yemen, May 19, 2016 (Reuters)

Tribesmen loyal to the Houthi movement perform the Baraa dance during a gathering to show support to the movement in Sanaa, Yemen, May 19, 2016 (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Sri Lanka Floods 2016

Severe flooding in Sri Lanka has forced half a million people to flee their homes across the island nation, officials say, as the death toll from days of torrential rain and landslides rose to more than 60. (Reuters)

Saudia Flight 163

Saudia Flight 163 caught fire after takeoff from Riyadh International Airport on a flight to Jeddah on August 19, 1980. All 287 passengers and 14 crew on board died. (AP)

Yemenia Flight 626

153 people on board belonging to Yemen's state airline Yemenia crashed into choppy seas as it came in to land on the Indian Ocean archipelago of Comoros on Tuesday, June 30, 2009. The sole survivor, 14-year-old Bahia Bakari, was found clinging to wreckage. (Wiki)

Metrojet Flight 9268

Metrojet Flight 9268 disintegrated above the northern Sinai on 31 October 2015 a following its departure from Sharm el-Sheikh International Airport, Egypt. All 224 passengers and crew on board died. (AP)

Saudi Arabian Airlines - Kazakhstan Airlines collision

Known as the Charkhi Dadri mid-air collision incident in 2996, 351 people died when a Saudi Arabian Airlines Boeing 747 and a Kazakhstan Airlines en route from Chimkent, Kazakhstan, to Delhi collided midair. (AP)

Turkish Airline Flight 981

Firemen stand near the fuselage of the Turkish Airlines DC10 jumbo jet carrying 345 persons which crashed into the Ermenonville forest, north of Paris, March 3, 1974, killing everyone aboard. (AP)

Afriqiyah Airways Flight 771

Afriqiyah Airways Flight 771 was a scheduled international passenger flight that crashed on 12 May 2010 on approach to Tripoli International Airport. Of the 104 passengers and crew on board, the sole survivor was 9-year-old Dutch boy Ruben van Assouw. (AP)

Agadir air disaster

The Agadir air disaster was a chartered Boeing 707 passenger flight on Sunday, August 3, 1975 that crashed into a mountain on approach to Agadir Inezgane Airport, Morocco. All 188 passengers and crew on board were killed. It is the deadliest aviation disaster involving a Boeing 707, as well as the deadliest in Morocco. (Wiki)

EgyptAir Flight 990

EgyptAir Flight MS990 crashed into the Atlantic Ocean about 60 miles (100 km) south of Nantucket Island, Massachusetts, killing all 217 people on board on 31 October 1999. (AP)

Gulf Air Flight 072

Gulf Air Flight 072 carried 143 passengers and crew on board when it crashed into Bahraini waters when it approached landing at higher speeds than normal and carried out an unusual low altitude orbit. (AP)