US President Joe Biden gestures as he speaks about gun violence prevention in the Rose Garden at the White House, in Washington.

Mourners hug at a vigil for the victims of a mass shooting at a grocery store earlier in the week, outside the courthouse in Boulder, Colorado.

People look on as a procession of emergency vehicles heads down Foothills Parkway to lead a hearse carrying the body of a Boulder, Colo., Police Department officer who was one of 1...

This photo provided by the Chicago Fire Department shows police investigating the scene of a shooting in the Park Manor neighborhood in Chicago. Fatal gunfire erupted at a party on...

Police investigate a car belonging to Station Head of Indigo Airlines Rupesh Singh, who was shot dead by unidentified bike borne criminals on Tuesday night, in Patna.

Police inspect the spot where mobile phone dealer Abhishek Agrawal was shot dead by miscreants in Muzaffarpur.

Thousands of people take part in a funeral march in Hanau, Germany. Several people were killed in a shooting in the central German city late Wednesday, Feb. 19, 2020.

Students gather on the campus of the University of North Carolina Charlotte after a shooting Tuesday afternoon in Charlotte, N.C.

People gather across from the campus of UNC Charlotte after a fatal shooting at the school in Charlotte, North Carolina.

Dutch Prime Minister Mark Rutte, right, and Justice Minister Ferd Grapperhaus, center, lay flowers at a makeshift memorial for victims of a shooting incident in a tram in Utrecht, ...

Students lay flowers near the site of a shooting incident in a tram in Utrecht, Netherlands.

A tram passes a rose at the site of a shooting incident in a tram in Utrecht, Netherlands. A gunman killed three people and wounded others on a tram in the central Dutch city of Ut...

A police officer stands guard in front of the Masjid Al Noor mosque in Christchurch, New Zealand where one of two mass shootings occurred. New Zealand's stricken residents reached ...

Children hold placards to condemn the New Zealand mosque attack, in Jammu.

A woman who lost her husband during Friday's mass shootings cries outside an information center for families in Christchurch, New Zealand. The white supremacist gunman appeared in ...

In this photo released by New Zealand Prime Minister's Office, Prime Minister Jacinda Ardern speaks to representatives of the Muslim community, at the Canterbury Refugee Centre in ...

A woman pauses as she lays flowers on a wall at the Botanical Gardens, Christchurch, New Zealand. .

Mourners paying their respects at a makeshift memorial near the Masjid Al Noor mosque Christchurch, New Zealand, where one of the two mass shootings occurred. The white supremacist...

A women places flowers at a makeshift memorial near the Masjid Al Noor mosque in Christchurch, New Zealand where one of the mass shootings occurred yesterday.

A police officer patrols at a cordon near a mosque in central Christchurch, New Zealand. Multiple people were killed in mass shootings at two mosques full of worshippers attending ...