epa08341640 A woman wearing a protective face mask walks past a couple sitting at the Kadikoy harbour on the Bosphorus amid the ongoing coronavirus COVID-19 pandemic in Istanbul, Turkey, 03 April 2020. Turkey suspended all international flights and all inter-city travels are subject to local authorities' permission as part of measures to prevent the spread of the pandemic COVID-19 disease caused by the SARS-CoV-2 coronavirus. The country decided also to halt public events, temporarily shut down schools, and suspend sporting events. EPA/SEDAT SUNA
A man wearing a mask to protect against the spread of the coronavirus, walks on the deserted Istiklal Street, the main shopping street in Istanbul, in Istanbul, late Friday, April 3, 2020. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death. (AP Photo/Emrah Gurel)
A commuter in a mask uses the escalators during the coronavirus outbreak in a nearly deserted underground station in central Istanbul, Friday, April 3, 2020. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death. (AP Photo/Emrah Gurel)
A woman prays during the coronavirus outbreak at the Eyup Sultan Mosque, in Istanbul, Friday, April 3, 2020. After the fifth and final call to prayer of the day in Muslim Turkey, imams around the country have been asked to perform an additional prayer asking for God's mercy and protection during the novel coronavirus pandemic. Calls echoed across the city of Istanbul, Turkey's largest, as thousands of people have been infected with the virus and others have died. (AP Photo/Emrah Gurel)
Commuters in an underground train are driven past a billboard of a book advertisement featuring a picture of U.S. President Benjamin Franklin on the 100-U.S. dollar bill, in central Istanbul, Friday, April 3, 2020. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death. (AP Photo/Emrah Gurel)
A commuter wears a mask in an underground station during the coronavirus outbreak in central Istanbul, Friday, April 3, 2020. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death. (AP Photo/Emrah Gurel)
Imam of Eyup Sultan Mosque, Hasan Tok, right, and Imam Metin Cakar, left, hold a prayer for coronavirus in Istanbul, Friday, April 3, 2020. After the fifth and final call to prayer of the day in Muslim Turkey, imams around the country have been asked to perform an additional prayer asking for God's mercy and protection during the novel coronavirus pandemic. Calls echoed across the city of Istanbul, Turkey's largest, as thousands of people have been infected with the virus and hundreds have already died. (AP Photo/Emrah Gurel)
Historical Galata Tower is pictured during the outbreak of the coronavirus disease (COVID-19) in Istanbul, Turkey, April 3, 2020. REUTERS/Umit Bektas
epa08341640 A woman wearing a protective face mask walks past a couple sitting at the Kadikoy harbour on the Bosphorus amid the ongoing coronavirus COVID-19 pandemic in Istanbul, Turkey, 03 April 2020. Turkey suspended all international flights and all inter-city travels are subject to local authorities' permission as part of measures to prevent the spread of the pandemic COVID-19 disease caused by the SARS-CoV-2 coronavirus. The country decided also to halt public events, temporarily shut down schools, and suspend sporting events. EPA/SEDAT SUNA
A man wearing a mask to protect against the spread of the coronavirus, walks on the deserted Istiklal Street, the main shopping street in Istanbul, in Istanbul, late Friday, April 3, 2020. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death. (AP Photo/Emrah Gurel)
A commuter in a mask uses the escalators during the coronavirus outbreak in a nearly deserted underground station in central Istanbul, Friday, April 3, 2020. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death. (AP Photo/Emrah Gurel)
A woman prays during the coronavirus outbreak at the Eyup Sultan Mosque, in Istanbul, Friday, April 3, 2020. After the fifth and final call to prayer of the day in Muslim Turkey, imams around the country have been asked to perform an additional prayer asking for God's mercy and protection during the novel coronavirus pandemic. Calls echoed across the city of Istanbul, Turkey's largest, as thousands of people have been infected with the virus and others have died. (AP Photo/Emrah Gurel)
Commuters in an underground train are driven past a billboard of a book advertisement featuring a picture of U.S. President Benjamin Franklin on the 100-U.S. dollar bill, in central Istanbul, Friday, April 3, 2020. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death. (AP Photo/Emrah Gurel)
A commuter wears a mask in an underground station during the coronavirus outbreak in central Istanbul, Friday, April 3, 2020. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death. (AP Photo/Emrah Gurel)
Imam of Eyup Sultan Mosque, Hasan Tok, right, and Imam Metin Cakar, left, hold a prayer for coronavirus in Istanbul, Friday, April 3, 2020. After the fifth and final call to prayer of the day in Muslim Turkey, imams around the country have been asked to perform an additional prayer asking for God's mercy and protection during the novel coronavirus pandemic. Calls echoed across the city of Istanbul, Turkey's largest, as thousands of people have been infected with the virus and hundreds have already died. (AP Photo/Emrah Gurel)
Historical Galata Tower is pictured during the outbreak of the coronavirus disease (COVID-19) in Istanbul, Turkey, April 3, 2020. REUTERS/Umit Bektas
epa08341640 A woman wearing a protective face mask walks past a couple sitting at the Kadikoy harbour on the Bosphorus amid the ongoing coronavirus COVID-19 pandemic in Istanbul, Turkey, 03 April 2020. Turkey suspended all international flights and all inter-city travels are subject to local authorities' permission as part of measures to prevent the spread of the pandemic COVID-19 disease caused by the SARS-CoV-2 coronavirus. The country decided also to halt public events, temporarily shut down schools, and suspend sporting events. EPA/SEDAT SUNA