They will bolster the city's struggling police force for three months, patrolling on foot and in vehicles through districts identified as criminal hotspots.

Soldiers have been used in similar missions in Cape Town before but violence has peaked in recent months in the sprawling townships of the Cape Flats area, one of the most violent places in South Africa.

General Solly Shoke, chief of the South African National Defence Force (SANDF), said the military "will deploy a battalion with support elements during the operation."

The size of the deployment was not revealed nor the start date, expected to be within days.

Neighbourhoods including Bonteheuwel, Delft, Hanover Park and Philippi East have been plagued by gang-related violence, with the much-criticised police force unable to impose order.

Police Minister Bheki Cele said the "intense deployment" of the military would last three months.

"We believe that by the time that time comes, we would have normalised the situation and we'll sustain that through normal policing," he said.

- 'Door-to-door' searches -

According to Cele, murders in the Western Cape province, which includes Cape Town, increased by 6.3 percent from 3,729 to 3,963 during the year to April 2019.

"We'll go door to door, we'll collect every illegal firearm, we'll collect all criminals that we want, we'll collect all outstanding criminals that have been on bail and that is happening from two o'clock this (Friday) morning," Cele told reporters.

Cape Town, an international tourist destination with stunning coastal and mountain scenery, has the highest murder rate in the country, according to the latest official crime figures.

Last year, over 20,000 people were murdered in South Africa -- 57 per day -- and Cele has described the country as "close to the war zone."

The main opposition Democratic Alliance party, which has governed the Western Cape since 2011, welcomed the temporary military intervention saying it was long overdue.

"Countless mothers have buried their innocent children and life in these communities has been a never-ending nightmare," it said in a statement.

"The DA trusts that the deployment of the SANDF to various communities in the Western Cape will bring much-needed stability in the Western Cape."

Youth unemployment is over 50 percent in many poorer parts of South Africa, which is the most unequal country in the world according to World Bank measurements.

Many wealthy people live in fortified homes with high walls topped with electrical wires, CCTV monitoring and armed guards.