Cyprus lies very close to the Middle East and has in recent days been used as a transit point for people either leaving or going to the region amid a conflict between regional foes Israel and Iran.
Authorities fear antisemitic attacks may come from a radicalized foreigner, a lone wolf from the Middle East, or anarchists and armed groups, according to a report by Mega.
In a press release, Police Director Håkon Skulstad stated: "This is a preventive measure to strengthen security in a situation with increased risk of attacks against certain targets in Norway."
A total of 1,600 police officers, alongside hundreds of volunteers, the city’s SLA unit, security personnel, stewards, and municipal police, will be on hand to ensure the event runs smoothly.
Police gave no initial toll but said "several" people were dead and they were working in the assumption there was only one attacker.
Border Police officers arrested dozens of illegal residents around the outskirts of Jerusalem over the weekend.
The police discovered images of Christian crosses, spray-painted onto the door of a house near the scene.
A few notable Israeli politicians attended the march to show solidarity for the LGBTQ+ community.
A source involved in the search operation said the targeted area was "vast" with police using ground-penetrating radar across several hectares.
Prisoners ran through the area throughout the night, some of them barefoot, with police giving chase, local TV footage showed.