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Bosnia, Jul 12: Bosnians commemorated on Saturday the massacre of about 8,000 Muslim men and boys in Srebrenica, marking the 25th anniversary of killings that shocked the world and have stood out as Europe's only atrocity since World War Two constituting genocide.

Nine newly identified victims were buried at a flower-shaped cemetery near the town, where tall white tombstones mark the graves of 6,643 other victims.

"After 25 years we succeeded in finding his mortal remains, so they can be laid to their final rest," said Fikret Pezic, who buried his father Hasan.

The remains of some 1,000 victims of the massacre in the eastern town during Bosnia's 1992-1995 war are still missing.

Ifeta Hasanovic decided to bury incomplete remains of her husband, saying: "We were aware they cannot be complete after 25 years, at least there are some, I did not want to make any new delays."

World leaders addressed the ceremony by video link, unable to attend because of coronavirus epidemic. Instead of the tens of thousands visitors who typically attend the commemoration each year, only a few thousand came after organisers banned organised visits.

During the Bosnian war, Bosnian Serb forces pushed non-Serbs out of territories they sought for their Serb statelet. Fleeing Muslims took shelter in several eastern towns, including Srebrenica, that were designated as United Nations "safe zones".

On July 11, 1995, the Serb forces commanded by General Ratko Mladic overran Srebrenica, which was protected by lightly armed Dutch peacekeepers.

They sent women and children away and captured and executed the men and boys they found. The bodies were dumped into mass graves and later exhumed by U.N. investigators and used as evidence in war crimes trials of Bosnian Serb leaders.

"We grieve with the families that tirelessly seek justice for the 8,000 innocent lives lost, all these years later," said U.S. Secretary of State Mike Pompeo. Washington brokered Bosnia's peace deal months after the massacre.

Most people at the commemoration were Muslim Bosniaks, reflecting conflicting narratives about the bloodshed - which hinders reconciliation nearly 25 years after the end of war in which about 100,000 people were killed.

The U.N. war crimes tribunal for the former Yugoslavia convicted Mladic and his political chief Radovan Karadzic over Srebrenica genocide but they remained heroes for Serbs, many of whom deny that genocide happened.

On Saturday, the Serbs in the nearby town of Bratunac organised an event marking July 11 as the "Srebrenica Liberation Day".

Sefik Dzaferovic, the Bosniak chairman of Bosnia's tripartite presidency, called for legislation that would ban denial of genocide.

"There can be no trust as long as we witness attacks on the truth, denial of genocide and glorification and celebration of executors," Dzaferovic told the commemoration gathering.

The current physical distancing guidelines provided by the World Health Organisation (WHO) and by the US Centers for Disease Control and Prevention (CDC) may not be adequate to curb the coronavirus spread, according to a research which says the gas cloud from a cough or sneeze may help virus particles travel up to 8 metres. The research, published in the Journal of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.

Study author, MIT associate professor Lydia Bourouiba, warned that droplets of all sizes can travel 23 to 27 feet, or 7-8 metres, carrying the pathogen.

According to Bourouiba, the current guidelines are based on "arbitrary" assumptions of droplet size, "overly simplified", and "may limit the effectiveness of the proposed interventions" against the deadly pandemic.

 She explained that the old guidelines assume droplets to be one of two categories, small or large, taking short-range semi-ballistic trajectories when a person exhales, coughs, or sneezes.

However based on more recent discoveries, the MIT scientist said, sneezes and coughs are made of a puff cloud that carries ambient air, transporting within it clusters of droplets of a wide range of sizes.

Bourouiba warned that this puff cloud, with ambient air entrapped in it, can offer the droplets moisture and warmth that can prevent it from evaporation in the outer environment.

"The locally moist and warm atmosphere within the turbulent gas cloud allows the contained droplets to evade evaporation for much longer than occurs with isolated droplets," she said.

"Under these conditions, the lifetime of a droplet could be considerably extended by a factor of up to 1000, from a fraction of a second to minutes," the researcher explained in the study.

The MIT scientist, who has researched the dynamics of coughs and sneezes for years, added that these droplets settle along the trajectory of a cough or sneeze contaminating surfaces, with their residues staying suspended in the air for hours.

"Even when maximum containment policies were enforced, the rapid international spread of COVID-19 suggests that using arbitrary droplet size cutoffs may not accurately reflect what actually occurs with respiratory emissions, possibly contributing to the ineffectiveness of some procedures used to limit the spread of respiratory disease," Bourouiba wrote in the study