FBI releases never seen before photos of 9/11 attacks

Washington, Jun 24: Twitter has once again flagged a tweet from US President Donald Trump which promoted violence by saying if protesters tried to set up an "autonomous zone" in Washington, DC they would be met with "serious force".

This is the fourth time Twitter has red flagged Trump's tweet for glorifying violence or violating its policies.

Trump has been critical of the "autonomous zone" in Seattle, an area occupied by protestors for much of this month.

"We've placed a public interest notice on this Tweet for violating our policy against abusive behaviour, specifically, the presence of a threat of harm against an identifiable group," Twitter's safety team tweeted late Tuesday.

Trump had tweeted: "There will never be an ‘Autonomous Zone' in Washington, D.C., as long as I'm your President. If they try they will be met with serious force!"

Twitter earlier labeled a video tweeted by him which mocked CNN as manipulated media.

According to Twitter, "this Tweet has been labeled per our synthetic and manipulated media policy to give people more context".

In May, Twitter labeled two Trump tweets that made false claims about mail-in ballots in California.

Twitter later labeled another Trump tweet glorifying violence in which he said, "when the looting starts, the shooting starts."

Facebook also removed a Trump campaign ad featuring a symbol used by Nazis for political dissenters, saying the ad violated its policies.

Islamabad/Dhaka, May 25: The coronavirus pandemic and lockdowns coupled with travel restrictions and social distancing norms have muted the Eid celebrations in Pakistan and Bangladesh as worshippers in the two Muslim-majority countries marked the end of Ramzan in strictly-regulated prayer congregations.

A large number of people in the two countries were forced to stay indoors on the occasion of Eid al-Fitr, marking the end of the fasting month of Ramzan, due to the fears of contracting the novel coronavirus which has killed nearly 3.5 lakh people and infected over 5.4 million across the world.

In Pakistan, the government has issued strict instructions to observe social distancing while offering Eid prayers and asked people to avoid visiting relatives and hosting parties.

As the railways remained closed, many people could not travel to their hometowns for the most important festival.

Eid congregations were held at open places, mosques and Eidgahs in all major cities and towns while following strict standard operating procedures (SOPs) of social distancing and other precautionary measures. But in some areas, the people did not adhere to the SOPs and were seen thronging to their favourite shops to celebrate Eid.

Pakistan Prime Minister's Special Assistant on Health Zafar Mirza on Friday said the deadly infection would continue to multiply if precautions are not taken.

Earlier this month, the government announced the lifting of the countrywide lockdown imposed to curb the spread of the COVID-19 in phases, even as infections continued to rise in the country.

Pakistan's coronavirus cases on Monday reached 56,349 with 1,748 new patients while the death toll climbed to 1,167 after 34 people lost their lives in the last 24 hours.

The trajectory showed that the number was steadily going up with authorities fearing a rise in cases in the wake of the easing of lockdown before Eid.

But Prime Minister Imran Khan cited the economic havoc the virus restrictions had wreaked on citizens as the reason behind the decision to ease the restrictions.

He urged Pakistanis to forgo the traditional Eid festivity in view of the hundreds of fatalities caused by the coronavirus and the lives lost in Friday's plane crash in Karachi.

Ninety-seven people, including nine children, were killed and two passengers miraculously survived a fiery crash when a Pakistan International Airlines plane with 99 travellers on board plunged into a densely populated residential area near the Jinnah International Airport.

Most of the victims were travelling home to celebrate Eid.

In Bangladesh, millions of Muslims joined the strictly-regulated prayer congregations across the country.

Thousands of worshippers attended the prayer services at the Baitul Mukarram National Mosque in Dhaka while following the health and social distancing protocols to limit the spread of the coronavirus, bdnews24.com reported.

Despite the government directive for children and senior citizens not to participate in Eid prayers, many children and people aged over 60 attended the Eid prayers. Although social distancing rules were maintained to a large extent, people were seen flouting the norms, the report said.

As per the government order, no Eid congregation will be held in an open space, but people can perform the Eid prayers in mosques. However, everyone coming to the mosques for prayer must wear a mask, follow social distancing and other hygiene rules, said Islamic Foundation Secretary Kazi Nurul Islam.

On Sunday, Bangladesh reported 28 new fatalities, the highest single-day increase, bringing the death toll to 480.

The number of coronavirus cases in the country rose to 33,610 after 1,532 people tested positive on Sunday.

London, May 20: The current physical distancing guidelines of 6 feet may be insufficient to prevent COVID-19 transmission, according to a study which says a mild cough in low wind speeds can propel saliva droplets by as much as 18 feet.

Researchers, including those from the University of Nicosia in Cyprus, said a good baseline for studying the airborne transmission of viruses, like the one behind the COVID-19 pandemic, is a deeper understanding of how particles travel through the air when people cough.

In the study, published in the journal Physics of Fluids, they said even with a slight breeze of about four kilometres per hour (kph), saliva travels 18 feet in 5 seconds.

"The droplet cloud will affect both adults and children of different heights," said study co-author Dimitris Drikakis from the University of Nicosia.

According to the scientists, shorter adults and children could be at higher risk if they are located within the trajectory of the saliva droplets.

They said saliva is a complex fluid, which travels suspended in a bulk of surrounding air released by a cough, adding that many factors affect how saliva droplets travel in the air.

These factors, the study noted, include the size and number of droplets, how they interact with one another and the surrounding air as they disperse and evaporate, how heat and mass are transferred, and the humidity and temperature of the surrounding air.

In the study, the scientists created a computer simulation to examine the state of every saliva droplet moving through the air in front of a coughing person.

The model considered the effects of humidity, dispersion force, interactions of molecules of saliva and air, and how the droplets change from liquid to vapour and evaporate, along with a grid representing the space in front of a coughing person.

Each grid, the scientists said, holds information about variables like pressure, fluid velocity, temperature, droplet mass, and droplet position.

The study analysed the fates of nearly 1,008 simulated saliva droplets, and solved as many as 3.7 million equations.

"The purpose of the mathematical modelling and simulation is to take into account all the real coupling or interaction mechanisms that may take place between the main bulk fluid flow and the saliva droplets, and between the saliva droplets themselves," explained Talib Dbouk, another co-author of the study.

However, the researchers added that further studies are needed to determine the effect of ground surface temperature on the behaviour of saliva in air.

They also believe that indoor environments, especially ones with air conditioning, may significantly affect the particle movement through air.

This work is important since it concerns safety distance guidelines, and advances the understanding of the transmission of airborne diseases, Drikakis said.