A man speaks on the mobile phone in front of a closed business, after the region of Lombardy became an "orange zone", increasing restrictions due to a rise in coronavirus disease (COVID-19) infections, in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

Empty chairs and tables of a closed bar are seen after the region of Lombardy became an "orange zone", increasing restrictions due to a rise in coronavirus disease (COVID-19) infections, in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

A closed restaurant is seen after the region of Lombardy became an "orange zone", increasing restrictions due to a rise in coronavirus disease (COVID-19) infections, in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

Members of the Red Cross stand next to nuns that wait to receive the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

A nun waits to receive a dose of the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

A member of the Red Cross speaks with a nun before she receives the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

Nuns wait to receive the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

A nun receives a dose of the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

A health worker speaks with a nun after giving her a dose of the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

Nuns wait to receive the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo TPX IMAGES OF THE DAY

American Gabriel Natale-Hjorth, one of two men accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, walks past Rosa Maria Esilio, widow of the slain officer, and Paolo Cerciello Rega, brother of Mario, prior to a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

American Finnegan Lee Elder, one of two men accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, walks past Rosa Maria Esilio, widow of the slain officer, and Paolo Cerciello Rega, brother of Mario, prior to a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

American Gabriel Natale-Hjorth, one of two men accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, looks on prior to a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

American Finnegan Lee Elder, one of two men accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, looks at documents prior to a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

American Finnegan Lee Elder, one of two men accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, looks on prior to a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

American Gabriel Natale-Hjorth, one of two men accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, looks on prior to a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

A health worker prepares a dose of the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

A health worker stands in front of a woman who waits to receive a dose of the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

A man waits next to a painted wall to receive a dose of the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

Rosa Maria Esilio, widow of slain Carabinieri military police officer Mario Cerciello Rega, Paolo Cerciello Rega, brother of Mario, and Franco Coppi, lawyer of the family, arrive for a hearing in the trial of Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of the killing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

American Finnegan Lee Elder, one of two men accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, looks on prior to a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

American Finnegan Lee Elder, one of two men accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, talks with his lawyer Renato Borzone prior to a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

Americans Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, attend a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

A health worker prepares a dose of the coronavirus disease (COVID-19) vaccine for a woman in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

Franco Coppi, lawyer of slain Carabinieri military police officer Mario Cerciello Rega's family, speaks with Prosecutor Maria Sabina Calabretta upon arrival for a hearing in the trial of Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of the killing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

Franco Coppi, lawyer of slain Carabinieri military police officer Mario Cerciello Rega's family, speaks with Prosecutor Maria Sabina Calabretta upon arrival for a hearing in the trial of Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of the killing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

Americans Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, attend a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

An elderly woman receives a dose of the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

Americans Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, attend a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

Americans Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, attend a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

People wait to receive the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

A man waits to receive a dose of the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

A woman receives a dose of the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

People wait to get the coronavirus disease (COVID-19) vaccine in Bergamo, Italy, March 1, 2021. REUTERS/Flavio Lo Scalzo

Rosa Maria Esilio, widow of slain Carabinieri military police officer Mario Cerciello Rega, smokes next to Paolo Cerciello Rega, brother of Mario, upon arrival for a hearing in the trial of Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of the killing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

Rosa Maria Esilio, widow of slain Carabinieri military police officer Mario Cerciello Rega, and Paolo Cerciello Rega, brother of Mario, arrive for a hearing in the trial of Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of the killing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

Rosa Maria Esilio, widow of slain Carabinieri military police officer Mario Cerciello Rega, and Paolo Cerciello Rega, brother of Mario, talk with a Carabinieri officer upon arrival for a hearing in the trial of Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of the killing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

Rosa Maria Esilio, widow of slain Carabinieri military police officer Mario Cerciello Rega, looks on upon arrival for a hearing in the trial of Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of the killing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

Rosa Maria Esilio, widow of slain Carabinieri military police officer Mario Cerciello Rega, looks on upon arrival for a hearing in the trial of Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of the killing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

Rosa Maria Esilio, widow of slain Carabinieri military police officer Mario Cerciello Rega, holds a photo of her husband upon arrival for a hearing in the trial of Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of the killing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

Rosa Maria Esilio, widow of slain Carabinieri military police officer Mario Cerciello Rega, looks on upon arrival for a hearing in the trial of Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of the killing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

Americans Gabriel Natale-Hjorth and Finnegan Lee Elder, accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, attend a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

American Finnegan Lee Elder, one of two men accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, attends a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

American Gabriel Natale-Hjorth, one of two men accused of killing Carabinieri military police officer Mario Cerciello Rega in Rome last year, attends a trial hearing, in Rome, Italy March 1, 2021. Alberto Pizzoli/Pool via REUTERS

An Emirates Airline aircraft flies over Cortina d'Ampezzo during the coronavirus disease (COVID-19) outbreak, Italy, February 19, 2021. Picture taken February 19, 2021. REUTERS/Denis Balibouse

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AC Milan's Technical Director Paolo Maldini celebrates with Theo Hernandez and Simon Kjaer after the match REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AC Milan coach Stefano Pioli with Fikayo Tomori after the match REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AC Milan's Brahim Diaz in action with AS Roma's Rick Karsdorp REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AC Milan's Gianluigi Donnarumma and Theo Hernandez after the match REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AS Roma's Bruno Peres in action with AC Milan's Franck Kessie REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AC Milan coach Stefano Pioli REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AC Milan coach Stefano Pioli REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AC Milan's Fikayo Tomori in action REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AC Milan's Rafael Leao in action with AS Roma's Bruno Peres and Henrikh Mkhitaryan REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 General view as AC Milan's Theo Hernandez takes a corner REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AC Milan's Theo Hernandez in action with AS Roma's Lorenzo Pellegrini REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AC Milan's Ante Rebic leaves the pitch as he is substituted REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AC Milan's Ante Rebic speaks to coach Stefano Pioli before he is substituted REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AC Milan's Ante Rebic REUTERS/Alberto Lingria

Soccer Football - Serie A - AS Roma v AC Milan - Stadio Olimpico, Rome, Italy - February 28, 2021 AS Roma's Borja Mayoral in action with AC Milan's Fikayo Tomori REUTERS/Alberto Lingria