The Pentecostal Church in Dlangubo, KwaZulu-Natal had gathered to celebrate Passover when a storm and heavy winds caused the building to collapse.
Worshippers had gathered in the church, located in Diangubo, KwaZulu-Natal, for a religious service organised as a precursor to Easter Sunday.
The wall at the front of the Pentecostal Holiness Church collapsed at the start of what had been planned as a weekend-long service to commemorate the Christian festival of Easter.
The 13 congregants who were killed when a KwaZulu-Natal church collapsed had been asleep at the time of the incident, police revealed on Friday.
NKorea says it tested new weapon, wants Pompeo out of talks
It is North Korea's first public weapons test since the second US-North Korea summit in Hanoi ended with no agreement in February. The test was announced after satellite images from last week were released showing activity at North Korea's main nuclear site.
According to local emergency services 29 people were rushed to hospital following the devastating collapse.
She said: "The congregants were sleeping in the building after the church service ended just after 10pm". However, early reports suggest that the roof collapsed under persistent heavy rains.
Disaster Management Centre officials and Cooperative Governance and Traditional Affairs MEC, Nomusa Dube-Ncube, are expected to visit the site to assess the situation and provide support for the affected families. We join hands with them, acutely aware of the excruciating pain that they must be going through.
Posting on Facebook, IPSS said that teams attended to four structural collapses, nine accidents, flooding complaints and treated 22 people all related to the storm.