The Week in Pictures: May 15 - 22

9/11 flag returns to WTC, Serena reflects a win, a Nigerian mom wants her girl back, British bombs blasted, a sloth squeezes through and more.

A long time exposure shows smoldering remains of overnight fires on the hillsides of San Marcos, Calif., early on May 16. Over 1,000 firefighters battled a series of fast-moving southern California wildfires on May 15 that spread across the region despite the efforts of more than 20 firefighting aircrafts.

Stuart Palley / EPA

A paddle boarder watches as two firefighting helicopters take water from the Pacific Ocean off of San Clemente, Calif, on May 16. The water-dropping helicopters were part of a larger effort combating three wildfires at the nearby Camp Pendleton Marine base.

Bailey Bianco

Firefighters help fold the National 9/11 Flag as it is transferred into the National Sept. 11 Memorial Museum's permanent collection on May 21 in New York City. The giant American flag, which was flying from a building beside the World Trade Center on September 11, 2001 and was later found badly damaged in the debris of ground zero, was unfurled at the World Trade Center site in a ceremony.

Spencer Platt / Getty Images North America

A jetliner leaves a vapour trail as it passes in front of the moon on May 20, taken from the Algerian capital Algiers.

Farouk Batiche / AFP

Sudanese Armed Forces (SAF) and Rapid Support Forces (RSF) personnel ride on a tank after recapturing the Daldako area, outside the military headquarters in Kadogli on May 20. The SAF had recaptured the Daldako area, east of the South Kordofan state capital of Kadogli, from rebels on Sunday.

Mohamed Nureldin Abdallah / X01806

People are carried by a front loader as they evacuate from their flooded homes in Topcic Polje, Bosnia, on May 16. The heaviest rains and floods in 120 years have hit Bosnia and Serbia, forcing hundreds out of their homes and cutting off entire towns. The flooding has led to at least 51 deaths: 27 in Serbia, 22 in Bosnia, and two in Croatia.

Dado Ruvic / X02714

Flood victim Pavlovic Oksana stands on the front porch of her damaged house in Krupanj on May 20, after the western Serbian town was hit with floods and landslides, cutting it off for four days. Serbia declared three days of national mourning on May 20 as the death toll rose and health officials warned of a possible epidemic.

Andrej Isakovic / AFP

A member of the Air Force perspires behind his shield after anti-government protesters broke into a base in Bangkok on May 15.

Thailand's military seized power May 22 in a bloodless coup, dissolving the government, scrapping the constitution and dispersing groups of protesters from both sides of the country's political divide who had gathered in Bangkok and raised fears of a violent showdown.

Damir Sagolj / X90027

Serena Williams is reflected in the Italian Open trophy as she holds it up after defeating Italy's Sara Errani at the tennis tournament in Rome, on May 18. Serena Williams kept the crowd from being a factor in a 6-3, 6-0 victory over 10th-seeded Sara Errani to win the Italian Open for the third time Sunday.

Andrew Medichini / AP

Beach goers watch the detonation of a 500 pound British bomb on the beach on May 19 in Wassenaar, Netherlands. The bomb was dropped by the British allied forces during World War II over nearby Leiden where it was found on a building site.

Michel Porro / Getty Images Europe

Rachel Daniel, 35, holds up a picture of her abducted daughter Rose Daniel, 17, as her son Bukar, 7, sits beside her at her home in Maiduguri, Nigeria on May 21. Rose was abducted along with more than 200 of her classmates on April 14 by Boko Haram militants from a secondary school in Chibok, Nigeria.

Joe Penney / X02952

A Ukrainian government soldier rests inside an armored personnel carrier at a checkpoint near Slovyansk, Ukraine, on May 21.

Petr Shelomovskiy / AP

People take part in a soccer match held at the Tavares Bastos slum in Rio de Janeiro on May 18. The World Cup will be held in 12 cities in Brazil from June 12 through July 13.

Pilar Olivares / X00856

Kenyan riot police clash with students inside a classroom in Nairobi University on May 20. The students were protesting against a controversial university fee increment which ended in a riot with tear gas fired and riot police forcing their way inside the university to arrest students after rocks were thrown.

Carl De Souza / AFP

Bodies covered with blankets lie in a field near the village of Blahodatne, eastern Ukraine, on May 22, as a Ukrainian soldier smokes next to his armored infantry vehicle. At least 11 Ukrainian troops were killed and about 30 others were wounded when Pro-Russians attacked a military checkpoint, the deadliest raid in the weeks of fighting in eastern Ukraine.

Ivan Sekretarev / AP

Lines mark the sand during low tide in the Loire Estuary, with cabins and their traditional hanging fish nets in Paimboeuf, France, on May 15.

Stephane Mahe / X02520

A sloth peeks out from behind a door on a floating house in the 'Lago do Janauari' near Manaus, Brazil, on May 20.

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Felipe Dana / AP