A Bosnian special forces soldier returns fire in downtown Sarajevo as he and civilians come under fire from Serbian snipers, on April 6, 1992. The Serbs were shooting from the roof of a hotel at a peace demonstration of some of 30,000 people as fighting between Bosnian and Serb fighters escalated in the capital of Bosnia-Hercegovina. #

Smoke and flames rise from houses set on fire by heavy fighting between Bosnian Serbs and Muslims in the village of Ljuta on Mount Igman some 40km southwest from the besieged Bosnian capital of Sarajevo, on July 22, 1993. #

On her way home in afternoon on Thursday, April 8, 1993 in Sarajevo, a Bosnian woman rushes down an empty sidewalk past war-destroyed shops in one of the worst sections of the so-called "Sniper Alley." #

French troops of the United Nations patrol in front of the destroyed mosque of Ahinici, near Vitez, northwest of Sarajevo, on April 27, 1993. This Muslim town was destroyed during fighting between Croatian and Muslim forces in central Bosnia. #

A father's hands press against the window of a bus carrying his tearful son and wife to safety from the besieged city of Sarajevo during the Bosnian War on November 10, 1992. #

Bosnian Croat soldiers taken as prisoners pass a Bosnian Serb soldier after surrendering on the central Bosnian mountain of Vlasic June 8. About 7,000 Croat civilians and some 700 soldiers fled to Serb-held territories under heavy Muslim attack. #

122mm heavy artillery of the Bosnian government, in position near Sanski Most, 10 miles (15 kilometers), east of Banja Luka, opens fire at the Serb-controlled town of Prijedor, on October 13, 1995. #

A woman, standing between markers of fresh graves in a Sarajevo cemetery, mourns over the grave of a dead relative in the early morning, on January 17, 1993. More people came to visit graves of friends and relatives as the dense fog protected them from sniper fire. #

A top sniper, codenamed "Arrow," loads her gun in a safe room in Sarajevo, Tuesday, June 30, 1992. The 20-year old Serb who shoots for the Bosnian forces says she has lost count of the number of people she has killed, but that she finds it difficult to pull the trigger. The former journalism student says most of her targets are other snipers on the Serbian side. #

Rockets explode on Sarajevo downtown center, closed to the Cathedral, on June 5, 1992. Heavy shelling and fighting raged throughout the Bosnian capital overnight. Sarajevo radio said all parts of the city were hit by heavy artillery, leaving at least three people dead and 10 injured in the Muslim stronghold of Hrasnica, which faces the Southwest side of the airport. #

Participants in the Miss Besieged Sarajevo 93 beauty pageant line up on stage holding a banner reading, "Don't Let Them Kill Us" in front of a packed audience in Sarajevo, on May 29, 1993. #

Two prisoners sit on the ground during a visit of journalists and members of the Red Cross in a Serb camp in Tjernopolje, near Prijedor northwest Bosnia, on August 13, 1992. #

Smoke rises from an ammunition depot in Bosnian Serb stronghold of Pale, some 16 km (10 miles) east of Sarajevo, on August 30, 1995 after NATO air strikes. NATO jets went after Serb ammunition and radar sites as well as command and communication centers throughout Bosnia to eliminate threats to UN safe zones. #

Refugees from the overrun U.N. safe haven enclave of Srebrenica who had spent the night outdoors, gathering outside the U.N. base at Tuzla airport, on July 14, 1995. #

A Bosnian Muslim woman cries on the coffin of a relative during a mass funeral for victims killed during 1992-1995 war in Bosnia, whose remains were found in mass graves around the town of Prijedor and Kozarac, 50 km (31 miles) northwest of Banja Luka, on July 20, 2011. #

A Bosnian Muslim woman from Srebrenica, sitting under pictures of victims of the genocide in the town during the 1992-1995 Bosnian war, watches the television broadcast of Ratko Mladic's court proceedings, in Tuzla, on June 3, 2011. Former Bosnian Serb military commander Mladic said he defended his people and his country in the Bosnia war and now intended to defend himself against war crimes charges at the U.N.'s Yugoslavia tribunal. Mladic was indicted over the 43-month siege of the Bosnian capital Sarajevo and the massacre of 8,000 Muslim men and boys in the town of Srebrenica, close to the border with Serbia, during the 1992-95 Bosnian war. #

A Bosnian muslim man gestures as he mourns among caskets at Potocari Memorial Cemetery near Srebrenica, on July 10, 2011. This year's mass burial, marking the 16th anniversary of the fall of Srebrenica, re-grouped 615 bodies, collected from mass grave sites in Eastern Bosnia. In previous years, more than 4500 bodies were buried at Srebrenica Memorial Cemetery, after being excavated from mass graves in Eastern-Bosnia and positively identified. #

A young Muslim girl walks past a stone memorial bearing the names of victims of the 1995 Srebrenica massacre at the Potocari cemetery and memorial near Srebrenica on July 10, 2011 in Potocari, Bosnia and Herzegovina. At least 8,3000 Bosnian Muslim men and boys who had sought safe heaven at the U.N.-protected enclave at Srebrenica were killed by members of the Republic of Serbia (Republika Srpska) army. #

Zoran Laketa poses for a picture in front of a building destroyed during the 1992-1995 war in Bosnia, after an interview with Reuters, in Mostar, on April 2, 2012. Laketa epitomizes the complexities of the Bosnian conflict that kept the West dithering over intervention in the face of mass ethnic cleansing. Twenty years since the start of the war, ethnicity is still a deep dividing line - no more so than in Mostar, where Croats hold the west bank, Muslim Bosniaks the east, in an uncomfortable co-existence that has resisted foreign efforts to promote reintegration. #

Former Bosnian Serb leader Radovan Karadzic, center, stands in the courtroom during his initial appearance at U.N.'s Yugoslav war crimes tribunal in the Hague, Netherlands, on July 31, 2008. He faces charges of genocide, crimes against humanity and war crimes for allegedly masterminding atrocities throughout Bosnia's 1992-95 war. #

This before/after photo pair shows a disused tank standing at a crossroad in front of a ruined building in the Kovacici district in Sarajevo February 1996 and (click to view) people walking along the same road in the Kovacici district in Sarajevo, on May 30, 2011. [click image to view transition] #

This before/after photo pair shows a United Nations peacekeeper stands at the construction site of a shelter in front of the damaged United Investment and Trading Company (UNITIC) Towers, and an Orthodox church in Sarajevo, in this picture taken in March 1993, and (click to view) cars pass by the renovated towers, on April 1, 2012. [click image to view transition] #

This before/after photo pair shows a man carrying a bag of firewood across a destroyed bridge near the burnt library in Sarajevo, on January 1, 1994 and a man carries a box over the same bridge (click to view), now repaired, on April 1, 2012. [click image to view transition] #

This before/after photo pair shows a Bosnian teenager carrying containers of water in front of destroyed trams at Skenderia square in the besieged Bosnian capital of Sarajevo, on June 22, 1993, and a woman passes through the same square (click to view), on April 4, 2012. [click image to view transition] #

An elderly woman leaves a flower on some of 11,451 empty chairs on the main street of Sarajevo on April 6, 2012. More than 11,000 red chairs, symbolizing 11,541 victim of the siege, lined Sarajevo's main avenue on Friday as Bosnians marked the 20th anniversary of the bloodiest conflict in Europe since World War II with songs and remembrance. Thousands of people gathered as a choir accompanied by a small classical orchestra performed an arrangement of 14 songs, most of them composed during the city's bloody siege. #

11,541 red chairs line Titova street in Sarajevo as the city marks the 20th anniversary of the start of the Bosnian war, on April 6, 2012. The anniversary finds the Balkan country still deeply divided, power shared between Serbs, Croats and Muslims in a single state ruled by ethnic quotas and united by the weakest of central governments. #

A child puts flowers on some of the child-sized chairs in the collection of 11,541 red chairs along Titova street in Sarajevo, as the city marks the 20th anniversary of the start of the Bosnian war, April 6, 2012. #