Fish lay strewn across the roadside after a truck carrying tons of fish crashed near Liepen, northeastern Germany, Friday, April 20, 2018. (Stefan Sauer/dpa via AP)

A WWII bomb is removed in Berlin, Friday, April 20, 2018. Berlin police evacuated thousands from a central area of the German capital and shut down the main train station for the removal of an unexploded World War II bomb found during recent construction work. (Britta Pedersen/dpa via AP)

20 April 2018, Germany, Konstanz: Culture mayor of Konstanz Andreas Osner (l) arrives for the premier of the controversial production of "Mein Kampf" (My struggle). Photo by: Felix K'stle/picture-alliance/dpa/AP Images

dpatop - Palestinian protesters prepare kites with home made firebombs during clashes along the Israel-Gaza border, east of Gaza City, Gaza Strip, 20 April 2018. Palestinians are marching for the 4th week of a six-week long protest, along the Gaza-Israel border, to highlight the hundreds of thousands of Palestinian refugees who were expelled or fled their homes during the 1948 war that marked Israel's creation. Activists use kites with burning rags dangling from their tails to set ablaze drying wheat fields on the Israeli side. Photo by: Wissam Nassar/picture-alliance/dpa/AP Images

Palestinian protesters prepare kites with home made firebombs during clashes along the Israel-Gaza border, east of Gaza City, Gaza Strip, 20 April 2018. Palestinians are marching for the 4th week of a six-week long protest, along the Gaza-Israel border, to highlight the hundreds of thousands of Palestinian refugees who were expelled or fled their homes during the 1948 war that marked Israel's creation. Activists use kites with burning rags dangling from their tails to set ablaze drying wheat fields on the Israeli side. Photo by: Wissam Nassar/picture-alliance/dpa/AP Images

dpatop - Palestinian protesters prepare kites with home made firebombs during clashes along the Israel-Gaza border, east of Gaza City, Gaza Strip, 20 April 2018. Palestinians are marching for the 4th week of a six-week long protest, along the Gaza-Israel border, to highlight the hundreds of thousands of Palestinian refugees who were expelled or fled their homes during the 1948 war that marked Israel's creation. Activists use kites with burning rags dangling from their tails to set ablaze drying wheat fields on the Israeli side. Photo by: Wissam Nassar/picture-alliance/dpa/AP Images

20 April 2018, Germany, Konstanz: Culture mayor of Konstanz Andreas Osner (l) arrives for the premier of the controversial production of "Mein Kampf" (My struggle). Photo by: Felix K'stle/picture-alliance/dpa/AP Images

Palestinian protesters prepare kites with home made firebombs during clashes along the Israel-Gaza border, east of Gaza City, Gaza Strip, 20 April 2018. Palestinians are marching for the 4th week of a six-week long protest, along the Gaza-Israel border, to highlight the hundreds of thousands of Palestinian refugees who were expelled or fled their homes during the 1948 war that marked Israel's creation. Activists use kites with burning rags dangling from their tails to set ablaze drying wheat fields on the Israeli side. Photo by: Wissam Nassar/picture-alliance/dpa/AP Images

dpatop - Palestinian protesters prepare kites with home made firebombs during clashes along the Israel-Gaza border, east of Gaza City, Gaza Strip, 20 April 2018. Palestinians are marching for the 4th week of a six-week long protest, along the Gaza-Israel border, to highlight the hundreds of thousands of Palestinian refugees who were expelled or fled their homes during the 1948 war that marked Israel's creation. Activists use kites with burning rags dangling from their tails to set ablaze drying wheat fields on the Israeli side. Photo by: Wissam Nassar/picture-alliance/dpa/AP Images

dpatop - Palestinian protesters prepare kites with home made firebombs during clashes along the Israel-Gaza border, east of Gaza City, Gaza Strip, 20 April 2018. Palestinians are marching for the 4th week of a six-week long protest, along the Gaza-Israel border, to highlight the hundreds of thousands of Palestinian refugees who were expelled or fled their homes during the 1948 war that marked Israel's creation. Activists use kites with burning rags dangling from their tails to set ablaze drying wheat fields on the Israeli side. Photo by: Wissam Nassar/picture-alliance/dpa/AP Images

20 April 2018, Germany, Konstanz: Culture mayor of Konstanz Andreas Osner arrives for the premier of the controversial production of "Mein Kampf" (My struggle). Photo by: Felix K'stle/picture-alliance/dpa/AP Images

Palestinian protesters fly kites with home made firebombs and swastikas drawn on them during clashes along the Israel-Gaza border, east of Gaza City, Gaza Strip, 20 April 2018. Palestinians are marching for the 4th week of a six-week long protest, along the Gaza-Israel border, to highlight the hundreds of thousands of Palestinian refugees who were expelled or fled their homes during the 1948 war that marked Israel's creation. Activists use kites with burning rags dangling from their tails to set ablaze drying wheat fields on the Israeli side. Photo by: Wissam Nassar/picture-alliance/dpa/AP Images

20 April 2018, Germany, Fuerth: Soccer, German Second Bundesliga, SpVgg Greuther Fuerth vs VfL Bochum at Sportpark Ronhof Thomas Sommer: A football is displayed. Photo by: Timm Schamberger/picture-alliance/dpa/AP Images

20 April 2018, Germany, Konstanz: Theatre director Christoph Nix (m) arrives for the premier of the controversial production of "Mein Kampf" (My struggle). Photo by: Felix K'stle/picture-alliance/dpa/AP Images

dpatop - Palestinian protesters prepare kites with home made firebombs during clashes along the Israel-Gaza border, east of Gaza City, Gaza Strip, 20 April 2018. Palestinians are marching for the 4th week of a six-week long protest, along the Gaza-Israel border, to highlight the hundreds of thousands of Palestinian refugees who were expelled or fled their homes during the 1948 war that marked Israel's creation. Activists use kites with burning rags dangling from their tails to set ablaze drying wheat fields on the Israeli side. Photo by: Wissam Nassar/picture-alliance/dpa/AP Images