Tens of thousands of Israelis, many from nationalist groups, have taken part in the annual Jerusalem Day flag march to mark the capture of the east of the city in the 1967 war.Crowds waving Israeli flags and shouting anti-Arab slogans gathered outside the Old City’s Damascus Gate before marching to the Western Wall through the Muslim Quarter – an act seen by Palestinians as a provocation.Palestinian shops along the procession route closed, amid a heavy Israeli police presence, with 3,000 officers deployed.Police later said that 18 people were arrested, including five for attacking…