In a statement Wednesday, the parliament said President Cyril Ramaphosa had authorised the deployment to support Mozambique in its fight against "acts of terrorism and violent extremists".

Attacks have escalated in northern Mozambique over the past year, fuelling fears the violence could spill over into neighbouring countries.

Since 2017, the Cabo Delgado region has been battered by a bloody jihadist insurgency that has killed more than 3,100 people, according to conflict data tracker ACLED, and displaced more than 800,000 people.

The three-month mission for South Africa's force -- from July 15 to October 15 -- is part of a deal agreed in June by the 16 nations of the Southern African Development Community (SADC).

The operation is expected to cost the country more than 984 million rand (about $66 million), said the parliamentary statement.

South Africa is the latest country in the region to despatch troops to Mozambique after Botswana which sent its soldiers on Monday. Earlier this month, Rwanda sent in a 1,000-strong force.

- Mozambique welcomes help -

On Tuesday the Angolan National Assembly approved the deployment, from August 6, of 20 military personnel as part of the SADC mission.

The SADC approved the deployment of its "Standby Force" late last month to help smoke out the Islamic State-linked militants that have been terrorising its gas-rich north for nearly four years.

In a televised address on Sunday Mozambique President Filipe Nyusi, who had long been seen as resisting foreign intervention, lauded the military mobilisation by African countries.

Foreign forces will "help Mozambican forces restore peace and stability," he said, adding "we should be afraid of being alone in fighting terrorism".

The attacks by the jihadists escalated from last year, culminating on March 24 with coordinated raids on the port town of Palma in which dozens of people were killed, some decapitated, and tens of thousands displaced.

The recent violence disrupted major gas exploration projects and raised fears it could spread to neighbouring countries -- placing pressure on Nyusi to accept foreign help.

The total force size of the SADC deployment is not yet known.

The European Union on July 12 formally established a military mission for Mozambique to help train its armed forces battling the jihadists.

Former colonial ruler Portugal is already providing training for Mozambican troops, with Lisbon's military instructors expected to make up some half of the new EU mission.