JOHANNESBURG — South African police and army held a parade on Wednesday involving helicopters, K-9 dog units and officers on motorcycles in a show of force ahead of expected protests around this weekend's Group of 20 (G20) world leaders summit in Johannesburg.

South Africa has deployed 3,500 extra police officers and put the army on standby under its National Joint Operational and Intelligence Structure, a body that brings police, army and intelligence services together under one command to provide security for major events.

Deputy national commissioner for policing Lieutenant General Tebello Mosikili told reporters that authorities were expecting protests in Johannesburg and other major cities.

"We will allow that right (to protest) to be exercised," she said. "But within the proper directives and proper confines of the law."

South African police said they have designated specific areas for protesters to gather near the summit venue, an exhibition centre next to the country's biggest soccer stadium.

The head of Airports Company South Africa, which runs the main international airports, said it had set up "speakers' corners" in airports where protesters would be "kindly" taken by security if they stage demonstrations when world leaders arrive.

Demonstrations are expected from anti-capitalists, climate activists, women's rights campaigners, anti-migrant groups and others, some of which are raising South Africa's own problems with poverty and inequality.

A trade union representing members of South Africa's Afrikaner white minority has already stoked controversy by putting up billboards around Johannesburg that say: "Welcome to the most RACE-REGULATED country in the world."

One of the boards was taken down by city authorities, prompting the Afrikaner trade union, Solidarity, to threaten legal action.

The billboards are in reference to South Africa's affirmative action laws that advance opportunities for Black people and have become part of a diplomatic fallout between South Africa and the United States.

US President Donald Trump won’t attend the G20 summit in a boycott over his claims that South Africa's Black-led government is pursuing racist, anti-white policies and violently persecuting its Afrikaner minority.

Trump's claims have been widely rejected as baseless, but the US government boycott threatens to undermine the first G20 summit in Africa. — Euronews