One of the South African twin brothers charged with plotting to blow up the U.S. embassy in Pretoria, allegedly asked the Islamic State group to send money and provide training for them to carry out a suicide bombing campaign in the country.

The allegation is contained in an affidavit presented at the Johannesburg magistrate's court on Friday to show that prosecutors had enough evidence to arrest Brandon-Lee and Tony-Lee Thulsie for planning terror attacks in South Africa.

The prosecution also presented documents including photographs of the twins wearing suicide vests, according to reports in South African media.

The twin brothers are among four people arrested earlier in July for plotting to attack several targets including the U.S. embassy in Pretoria and Jewish institutions.