A skullcap, sometimes called a kippah or yarmulke, is a cap worn by some male Jews under religious rules that say their heads should be covered. Commissioner Felix Klein, the German government's top official against anti-semitism, has warned Jewish people not to wear skullcaps in parts of the country because of a rise in anti-Semitic attacks. Mr Klein told the Funke newspaper group, ‘My opinion has unfortunately changed compared with what it used to be. I cannot recommend to Jews that they wear the skullcap at all times everywhere in Germany.’ According to statistics released earlier this month, anti-Semitic incidents were up by 19.6% to 1,799 in 2018, with 89.1% of them involving far-right perpetrators. Israeli President Reuven Rivlin said he was deeply shocked by Mr Klein's words. He added, ‘We will never submit, will never lower our gaze and will never react to anti-semitism with defeatism - and expect and demand our allies act in the same way.’